diff --git a/app/controllers/profiles/avatars_controller.rb b/app/controllers/profiles/avatars_controller.rb
index f193adb46b4..daa51ae41df 100644
--- a/app/controllers/profiles/avatars_controller.rb
+++ b/app/controllers/profiles/avatars_controller.rb
@@ -4,7 +4,6 @@ class Profiles::AvatarsController < Profiles::ApplicationController
     @user.remove_avatar!
 
     @user.save
-    @user.reset_events_cache
 
     redirect_to profile_path
   end
diff --git a/app/controllers/projects/avatars_controller.rb b/app/controllers/projects/avatars_controller.rb
index ada7db3c552..53788687076 100644
--- a/app/controllers/projects/avatars_controller.rb
+++ b/app/controllers/projects/avatars_controller.rb
@@ -20,7 +20,6 @@ class Projects::AvatarsController < Projects::ApplicationController
     @project.remove_avatar!
 
     @project.save
-    @project.reset_events_cache
 
     redirect_to edit_project_path(@project)
   end
diff --git a/app/models/event.rb b/app/models/event.rb
index 21eaca917b8..216dba46e74 100644
--- a/app/models/event.rb
+++ b/app/models/event.rb
@@ -43,12 +43,6 @@ class Event < ActiveRecord::Base
   scope :for_milestone_id, ->(milestone_id) { where(target_type: "Milestone", target_id: milestone_id) }
 
   class << self
-    def reset_event_cache_for(target)
-      Event.where(target_id: target.id, target_type: target.class.to_s).
-        order('id DESC').limit(100).
-        update_all(updated_at: Time.now)
-    end
-
     # Update Gitlab::ContributionsCalendar#activity_dates if this changes
     def contributions
       where("action = ? OR (target_type in (?) AND action in (?))",
diff --git a/app/models/issue.rb b/app/models/issue.rb
index 6e8f5d3c422..544f830cc69 100644
--- a/app/models/issue.rb
+++ b/app/models/issue.rb
@@ -182,18 +182,6 @@ class Issue < ActiveRecord::Base
     branches_with_iid - branches_with_merge_request
   end
 
-  # Reset issue events cache
-  #
-  # Since we do cache @event we need to reset cache in special cases:
-  # * when an issue is updated
-  # Events cache stored like  events/23-20130109142513.
-  # The cache key includes updated_at timestamp.
-  # Thus it will automatically generate a new fragment
-  # when the event is updated because the key changes.
-  def reset_events_cache
-    Event.reset_event_cache_for(self)
-  end
-
   # To allow polymorphism with MergeRequest.
   def source_project
     project
diff --git a/app/models/merge_request.rb b/app/models/merge_request.rb
index 6c3c093d084..bf9edb0b823 100644
--- a/app/models/merge_request.rb
+++ b/app/models/merge_request.rb
@@ -601,18 +601,6 @@ class MergeRequest < ActiveRecord::Base
     self.target_project.repository.branch_names.include?(self.target_branch)
   end
 
-  # Reset merge request events cache
-  #
-  # Since we do cache @event we need to reset cache in special cases:
-  # * when a merge request is updated
-  # Events cache stored like  events/23-20130109142513.
-  # The cache key includes updated_at timestamp.
-  # Thus it will automatically generate a new fragment
-  # when the event is updated because the key changes.
-  def reset_events_cache
-    Event.reset_event_cache_for(self)
-  end
-
   def merge_commit_message
     message = "Merge branch '#{source_branch}' into '#{target_branch}'\n\n"
     message << "#{title}\n\n"
diff --git a/app/models/note.rb b/app/models/note.rb
index 9ff5e308ed2..9881506edc8 100644
--- a/app/models/note.rb
+++ b/app/models/note.rb
@@ -198,19 +198,6 @@ class Note < ActiveRecord::Base
     super(noteable_type.to_s.classify.constantize.base_class.to_s)
   end
 
-  # Reset notes events cache
-  #
-  # Since we do cache @event we need to reset cache in special cases:
-  # * when a note is updated
-  # * when a note is removed
-  # Events cache stored like  events/23-20130109142513.
-  # The cache key includes updated_at timestamp.
-  # Thus it will automatically generate a new fragment
-  # when the event is updated because the key changes.
-  def reset_events_cache
-    Event.reset_event_cache_for(self)
-  end
-
   def editable?
     !system?
   end
diff --git a/app/models/project.rb b/app/models/project.rb
index 76c1fc4945d..21d9ed0f51f 100644
--- a/app/models/project.rb
+++ b/app/models/project.rb
@@ -973,7 +973,6 @@ class Project < ActiveRecord::Base
       begin
         gitlab_shell.mv_repository(repository_storage_path, "#{old_path_with_namespace}.wiki", "#{new_path_with_namespace}.wiki")
         send_move_instructions(old_path_with_namespace)
-        reset_events_cache
 
         @old_path_with_namespace = old_path_with_namespace
 
@@ -1040,22 +1039,6 @@ class Project < ActiveRecord::Base
     attrs
   end
 
-  # Reset events cache related to this project
-  #
-  # Since we do cache @event we need to reset cache in special cases:
-  # * when project was moved
-  # * when project was renamed
-  # * when the project avatar changes
-  # Events cache stored like  events/23-20130109142513.
-  # The cache key includes updated_at timestamp.
-  # Thus it will automatically generate a new fragment
-  # when the event is updated because the key changes.
-  def reset_events_cache
-    Event.where(project_id: self.id).
-      order('id DESC').limit(100).
-      update_all(updated_at: Time.now)
-  end
-
   def project_member(user)
     project_members.find_by(user_id: user)
   end
diff --git a/app/models/user.rb b/app/models/user.rb
index 29fb849940a..8a67aa94e79 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -704,20 +704,6 @@ class User < ActiveRecord::Base
       project.project_member(self)
   end
 
-  # Reset project events cache related to this user
-  #
-  # Since we do cache @event we need to reset cache in special cases:
-  # * when the user changes their avatar
-  # Events cache stored like  events/23-20130109142513.
-  # The cache key includes updated_at timestamp.
-  # Thus it will automatically generate a new fragment
-  # when the event is updated because the key changes.
-  def reset_events_cache
-    Event.where(author_id: id).
-      order('id DESC').limit(1000).
-      update_all(updated_at: Time.now)
-  end
-
   def full_website_url
     return "http://#{website_url}" if website_url !~ /\Ahttps?:\/\//
 
diff --git a/app/services/issuable_base_service.rb b/app/services/issuable_base_service.rb
index 575795788de..d698b295e6d 100644
--- a/app/services/issuable_base_service.rb
+++ b/app/services/issuable_base_service.rb
@@ -184,8 +184,6 @@ class IssuableBaseService < BaseService
     params[:label_ids] = process_label_ids(params, existing_label_ids: issuable.label_ids)
 
     if params.present? && update_issuable(issuable, params)
-      issuable.reset_events_cache
-
       # We do not touch as it will affect a update on updated_at field
       ActiveRecord::Base.no_touching do
         handle_common_system_notes(issuable, old_labels: old_labels)
diff --git a/app/services/notes/delete_service.rb b/app/services/notes/delete_service.rb
index 7f1b30ec84e..a673e8e9dde 100644
--- a/app/services/notes/delete_service.rb
+++ b/app/services/notes/delete_service.rb
@@ -2,7 +2,6 @@ module Notes
   class DeleteService < BaseService
     def execute(note)
       note.destroy
-      note.reset_events_cache
     end
   end
 end
diff --git a/app/services/notes/update_service.rb b/app/services/notes/update_service.rb
index 1361b1e0300..75a4b3ed826 100644
--- a/app/services/notes/update_service.rb
+++ b/app/services/notes/update_service.rb
@@ -5,7 +5,6 @@ module Notes
 
       note.update_attributes(params.merge(updated_by: current_user))
       note.create_new_cross_references!(current_user)
-      note.reset_events_cache
 
       if note.previous_changes.include?('note')
         TodoService.new.update_note(note, current_user)
diff --git a/app/services/projects/transfer_service.rb b/app/services/projects/transfer_service.rb
index 28470f59807..34ec575e808 100644
--- a/app/services/projects/transfer_service.rb
+++ b/app/services/projects/transfer_service.rb
@@ -61,9 +61,6 @@ module Projects
         # Move missing group labels to project
         Labels::TransferService.new(current_user, old_group, project).execute
 
-        # clear project cached events
-        project.reset_events_cache
-
         # Move uploads
         Gitlab::UploadsTransfer.new.move_project(project.path, old_namespace.path, new_namespace.path)
 
diff --git a/app/uploaders/avatar_uploader.rb b/app/uploaders/avatar_uploader.rb
index 71ff14a3f20..38683fdf6d7 100644
--- a/app/uploaders/avatar_uploader.rb
+++ b/app/uploaders/avatar_uploader.rb
@@ -3,16 +3,10 @@ class AvatarUploader < CarrierWave::Uploader::Base
 
   storage :file
 
-  after :store, :reset_events_cache
-
   def store_dir
     "uploads/#{model.class.to_s.underscore}/#{mounted_as}/#{model.id}"
   end
 
-  def reset_events_cache(file)
-    model.reset_events_cache if model.is_a?(User)
-  end
-
   def exists?
     model.avatar.file && model.avatar.file.exists?
   end
diff --git a/app/views/events/_event.html.haml b/app/views/events/_event.html.haml
index 5c318cd3b8b..a0bd14df209 100644
--- a/app/views/events/_event.html.haml
+++ b/app/views/events/_event.html.haml
@@ -3,14 +3,13 @@
     .event-item-timestamp
       #{time_ago_with_tooltip(event.created_at)}
 
-    = cache [event, current_application_settings, "v2.2"] do
-      = author_avatar(event, size: 40)
+    = author_avatar(event, size: 40)
 
-      - if event.created_project?
-        = render "events/event/created_project", event: event
-      - elsif event.push?
-        = render "events/event/push", event: event
-      - elsif event.commented?
-        = render "events/event/note", event: event
-      - else
-        = render "events/event/common", event: event
+    - if event.created_project?
+      = render "events/event/created_project", event: event
+    - elsif event.push?
+      = render "events/event/push", event: event
+    - elsif event.commented?
+      = render "events/event/note", event: event
+    - else
+      = render "events/event/common", event: event
diff --git a/changelogs/unreleased/events-cache-invalidation.yml b/changelogs/unreleased/events-cache-invalidation.yml
new file mode 100644
index 00000000000..2b30f4dcbce
--- /dev/null
+++ b/changelogs/unreleased/events-cache-invalidation.yml
@@ -0,0 +1,4 @@
+---
+title: Remove caching of events data
+merge_request: 6578
+author: