diff --git a/components/admin/Collections.vue b/components/admin/Collections.vue
index da19f814..5d6e976d 100644
--- a/components/admin/Collections.vue
+++ b/components/admin/Collections.vue
@@ -28,7 +28,7 @@ v-container
 
   v-btn(color='primary' text @click='newCollection') <v-icon v-text='mdiPlus'></v-icon> {{ $t('admin.new_collection') }}
 
-  v-dialog(v-model='dialog' width='900' destroy-on-close :fullscreen='$vuetify.breakpoint.xsOnly')
+  v-dialog(v-model='dialog' max-width='8000' width='800' destroy-on-close :fullscreen='$vuetify.breakpoint.xsOnly')
     v-card
       v-card-title {{ $t('admin.edit_collection') }}
       v-card-text
@@ -45,7 +45,7 @@ v-container
           h3(v-else class='text-h5' v-text='collection.name')
 
         v-row
-          v-col(cols=4)
+          v-col(cols=6)
             //- @input.native='searchActors'
             //- @focus='searchActors'
             v-autocomplete(v-model='filterActors'
@@ -55,6 +55,7 @@ v-container
               :disabled="!collection.id"
               placeholder='Local'
               return-object
+              hide-details
               item-value='ap_id'
               item-text='ap_id'
               :delimiters="[',', ';']"
@@ -70,23 +71,7 @@ v-container
                   v-chip(v-bind="attrs" close :close-icon='mdiCloseCircle' @click:close='parent.selectItem(item)'
                     :input-value="selected" label small) @{{ item?.object?.preferredUsername }}@{{ item?.instanceDomain }}
 
-          v-col(cols=4)
-            v-autocomplete(v-model='filterTags'
-              cache-items
-              :prepend-inner-icon="mdiTagMultiple"
-              chips small-chips multiple deletable-chips hide-no-data hide-selected persistent-hint
-              :disabled="!collection.id"
-              placeholder='All'
-              @input.native='searchTags'
-              @focus='searchTags'
-              :delimiters="[',', ';']"
-              :items="tags"
-              :label="$t('common.tags')")
-                template(v-slot:selection="{ item, on, attrs, selected, parent }")
-                  v-chip(v-bind="attrs" close :close-icon='mdiCloseCircle' @click:close='parent.selectItem(item)'
-                    :input-value="selected" label small) {{ item }}
-
-          v-col(cols=4)
+          v-col(cols=6)
             v-autocomplete(v-model='filterPlaces'
               cache-items
               :prepend-inner-icon="mdiMapMarker"
@@ -94,6 +79,7 @@ v-container
               auto-select-first
               clearable
               return-object
+              hide-details
               item-text='name'
               :disabled="!collection.id"
               @input.native="searchPlaces"
@@ -105,12 +91,32 @@ v-container
                   v-chip(v-bind="attrs" close :close-icon='mdiCloseCircle' @click:close='parent.selectItem(item)'
                     :input-value="selected" label small) {{ item.name }}
 
+          v-col(cols=6)
+            v-autocomplete(v-model='filterTags'
+              cache-items
+              :prepend-inner-icon="mdiTagMultiple"
+              chips small-chips multiple deletable-chips hide-no-data hide-selected persistent-hint
+              :disabled="!collection.id"
+              hide-details
+              placeholder='All'
+              @input.native='searchTags'
+              @focus='searchTags'
+              :delimiters="[',', ';']"
+              :items="tags"
+              :label="$t('common.tags')")
+                template(v-slot:selection="{ item, on, attrs, selected, parent }")
+                  v-chip(v-bind="attrs" close :close-icon='mdiCloseCircle' @click:close='parent.selectItem(item)'
+                    :input-value="selected" label small) {{ item }}
+
+
+
                 //- template(v-slot:item="{ item, attrs, on }")
                 //-   v-list-item(v-bind='attrs' v-on='on')
                 //-     v-list-item-content(two-line)
                 //-       v-list-item-title(v-text='item.name')
                 //-       v-list-item-subtitle(v-text='item.address')
-
+          v-col(cols=3)
+            v-switch(inset v-model='negateFilter' label='Not')
 
         v-data-table(
           :headers='filterHeaders'
@@ -121,6 +127,8 @@ v-container
             template(v-slot:item.actions='{ item }')
               v-btn(@click='removeFilter(item)' color='error' icon)
                 v-icon(v-text='mdiDeleteForever')
+            template(v-slot:item.negate='{ item }')
+              v-icon(v-text='item.negate ? mdiNotEqualVariant : mdiEqualBox' :color='item.negate ? "warning" : "success"')
             template(v-slot:item.tags='{ item }')
               v-chip.ma-1(small label v-for='tag in item.tags' v-text='tag' :key='tag')
             template(v-slot:item.places='{ item }')
@@ -131,8 +139,8 @@ v-container
 
       v-card-actions
         v-spacer
-        v-btn(color='primary' outlined :loading='loading' text @click='addFilter' :disabled='loading || !filterActors.length && !filterPlaces.length && !filterTags.length') add <v-icon v-text='mdiPlus'></v-icon>
-        v-btn(@click='dialog = false' outlined color='warning' :disabled="loading || filterActors.length || filterPlaces.length || filterTags.length") {{ $t('common.close') }}
+        v-btn(color='primary' outlined :loading='loading' text @click='addFilter' :disabled='loading || filterActors.length<1 && filterPlaces.length<1 && filterTags.length<1') add <v-icon v-text='mdiPlus'></v-icon>
+        v-btn(@click='dialog = false' outlined color='warning' :disabled="loading || filterActors.length>0 || filterPlaces.length>0 || filterTags.length>0") {{ $t('common.close') }}
 
   v-card-text
     v-data-table(
@@ -160,12 +168,14 @@ import debounce from 'lodash/debounce'
 import isEqual from 'lodash/isEqual'
 import sortBy from 'lodash/sortBy'
 
-import { mdiPencil, mdiChevronLeft, mdiChevronRight, mdiMagnify, mdiPlus, mdiTagMultiple, mdiMapMarker, mdiDeleteForever, mdiCloseCircle, mdiChevronDown, mdiWeb } from '@mdi/js'
+import { mdiPencil, mdiChevronLeft, mdiChevronRight, mdiMagnify, mdiPlus, mdiTagMultiple, mdiMapMarker, mdiDeleteForever,
+  mdiCloseCircle, mdiChevronDown, mdiWeb, mdiInformation, mdiNotEqualVariant, mdiEqualBox } from '@mdi/js'
 
 export default {
   data({ $store }) {
     return {
-      mdiPencil, mdiChevronRight, mdiChevronLeft, mdiMagnify, mdiPlus, mdiTagMultiple, mdiMapMarker, mdiDeleteForever, mdiCloseCircle, mdiChevronDown, mdiWeb,
+      mdiPencil, mdiChevronRight, mdiChevronLeft, mdiMagnify, mdiPlus, mdiTagMultiple, mdiMapMarker, mdiDeleteForever,
+      mdiCloseCircle, mdiChevronDown, mdiWeb, mdiInformation, mdiEqualBox, mdiNotEqualVariant,
       loading: false,
       dialog: false,
       valid: false,
@@ -173,6 +183,7 @@ export default {
       filterTags: [],
       filterPlaces: [],
       filterActors: [],
+      negateFilter: false,
       actors: [],
       tags: [],
       places: [],
@@ -187,6 +198,7 @@ export default {
         { value: 'actions', text: this.$t('common.actions'), align: 'right', width: 150, sortable: false }
       ],
       filterHeaders: [
+        { value: 'negate', text: '', width: 20, sortable: false },
         { value: 'actors', text: this.$t('common.actors') },
         { value: 'tags', text: this.$t('common.tags') },
         { value: 'places', text: this.$t('common.places') },
@@ -235,7 +247,7 @@ export default {
       const tags = this.filterTags
       const places = this.filterPlaces.map(p => ({ id: p.id, name: p.name }))
       const actors = this.filterActors.map(a => ({ ap_id: a.ap_id, name: a.object?.preferredUsername ?? a.object?.username, domain: a.instanceDomain  }))
-      const filter = { collectionId: this.collection.id, tags, places, actors }
+      const filter = { collectionId: this.collection.id, tags, places, actors, negate: this.negateFilter }
 
       // tags and places are JSON field and there's no way to use them inside a unique constrain
       const alreadyExists = this.filters.find(f =>
@@ -244,7 +256,10 @@ export default {
         isEqual(sortBy(f.actors), sortBy(filter.actors))
       )
 
-      if (alreadyExists) return
+      if (alreadyExists) {
+        this.$root.$message('Already exists', { color: 'warning' })
+        return
+      }
 
       const ret = await this.$axios.$post('/filter', filter )
       this.$fetch()
@@ -252,6 +267,7 @@ export default {
       this.filterTags = []
       this.filterPlaces = []
       this.filterActors = []
+      this.negateFilter = false
       this.loading = false
     },
     async editCollection(collection) {
diff --git a/server/api/controller/collection.js b/server/api/controller/collection.js
index f61321f5..47a22796 100644
--- a/server/api/controller/collection.js
+++ b/server/api/controller/collection.js
@@ -45,10 +45,10 @@ const collectionController = {
   async getEvents (req, res) {
     const settings = res.locals.settings
     const exportController = require('./export')
-    const format = req.params.format || 'json'
+    const format = req.params?.format ?? 'json'
     const name = req.params.name
-    const limit = req.query.max
-    const start = req.query.start_at || DateTime.local().toUnixInteger()
+    const limit = req.query?.max ?? 10
+    const start = req.query?.start_at ?? DateTime.local().toUnixInteger()
     const reverse = queryParamToBool(req.query.reverse)
     const older = queryParamToBool(req.query.older)
     const show_recurrent = settings.allow_recurrent_event && queryParamToBool(req.query.show_recurrent, settings.recurrent_event_visible)
@@ -78,15 +78,17 @@ const collectionController = {
   async _getEvents ({
     name, start, end,
     show_recurrent=false,
-    limit, include_description=false,
+    limit=10, include_description=false,
     older, reverse }) {
 
+    // get the collection from specified name
     const collection = await Collection.findOne({ where: { name } })
     if (!collection) {
       log.warn(`[COLLECTION] "%s" not found`, name)
       return []
     }
 
+    // and all related filters
     const filters = await Filter.findAll({ where: { collectionId: collection.id } })
 
     // collection is empty if there are no filters
@@ -118,32 +120,40 @@ const collectionController = {
     }
 
     const replacements = []
-    const ors = []
-
+    const conditions = []
+    const negatedConditions = []
+    
     // collections are a set of filters to match
     filters.forEach(f => {
 
-      let conditions = []
+      let tmpConditions = []
 
       if (f.tags && f.tags.length) {
         const tags = Sequelize.fn('EXISTS', Sequelize.literal(`SELECT 1 FROM event_tags WHERE ${Col('event_tags.eventId')}=event.id AND ${Col('tagTag')} in (?)`))
         replacements.push(f.tags)
-        conditions.push(tags)
+        tmpConditions.push(tags)
       }
 
       if (f.places && f.places.length) {
-          conditions.push({ placeId: f.places.map(p => p.id) })
+          tmpConditions.push({ placeId: f.places.map(p => p.id) })
       }
       
       if (f.actors && f.actors.length) {
-        conditions.push({ apUserApId: f.actors.map(a => a.ap_id)})
+        tmpConditions.push({ apUserApId: f.actors.map(a => a.ap_id)})
       }
 
-      if (!conditions.length) return
-      ors.push(conditions.length === 1 ? conditions[0] : { [Op.and]: conditions })
+      if (!tmpConditions.length) return
+      if (f.negate) {
+        negatedConditions.push(tmpConditions.length === 1 ? tmpConditions[0] : { [Op.and]: tmpConditions })
+      } else {
+        conditions.push(tmpConditions.length === 1 ? tmpConditions[0] : { [Op.and]: tmpConditions })
+      }
     })
 
-    where[Op.and] = { [Op.or]: ors }
+    where[Op.and] = {
+      ...(negatedConditions.length > 0 && { [Op.not]: negatedConditions}),
+      ...(conditions.length > 0 && { [Op.or]: conditions })
+    }
 
     const events = await Event.findAll({
       where,
@@ -213,14 +223,10 @@ const collectionController = {
   },
 
   async addFilter (req, res) {
-    const { collectionId, tags, places, actors } = req.body
+    const { collectionId, tags, places, actors, negate } = req.body
 
     try {
-      // if (actors?.length) {
-      //   const actors_to_follow = await APUser.findAll({ where: { ap_id: { [Op.in]: actors.map(a => a.ap_id) }} })
-      //   await Promise.all(actors_to_follow.map(followActor))
-      // }
-      const filter = await Filter.create({ collectionId, tags, places, actors })
+      const filter = await Filter.create({ collectionId, tags, places, actors, negate })
       return res.json(filter)
     } catch (e) {
       log.error(String(e))
diff --git a/server/api/models/filter.js b/server/api/models/filter.js
index 117d2aa7..5a4a0a2c 100644
--- a/server/api/models/filter.js
+++ b/server/api/models/filter.js
@@ -6,6 +6,9 @@ module.exports = (sequelize, DataTypes) =>
       primaryKey: true,
       autoIncrement: true,
     },
+    negate: {
+      type: DataTypes.BOOLEAN
+    },
     tags: {
       type: DataTypes.JSON,
     },
diff --git a/server/migrations/20240517093747-filter_collection_negate.js b/server/migrations/20240517093747-filter_collection_negate.js
new file mode 100644
index 00000000..33ee6dbc
--- /dev/null
+++ b/server/migrations/20240517093747-filter_collection_negate.js
@@ -0,0 +1,11 @@
+'use strict';
+
+module.exports = {
+  async up (queryInterface, Sequelize) {
+    return queryInterface.addColumn('filters', 'negate', { type: Sequelize.BOOLEAN })
+  },
+
+  async down (queryInterface, Sequelize) {
+    return queryInterface.removeColumn('filters', 'negate')
+  }
+}