Steam > Settings > Friends Tab > Notifications & Sounds section at bottom
(Un-tick "When any Friend joins a game"/"When I receive a message"? Not sure how the event notifications work actually as none of the options seems to apply.)
Comment has been collapsed.
17,239 Comments - Last post 7 minutes ago by Tucs
313 Comments - Last post 26 minutes ago by FeltHat
150 Comments - Last post 1 hour ago by fasderrally
13 Comments - Last post 3 hours ago by PTTsX
83 Comments - Last post 7 hours ago by MeguminShiro
47,459 Comments - Last post 8 hours ago by ManOman
550 Comments - Last post 9 hours ago by TdbSpidey
8 Comments - Last post 1 minute ago by DarkDreams1
11,462 Comments - Last post 26 minutes ago by Tsukurai
584 Comments - Last post 54 minutes ago by BanjoBearLV
95 Comments - Last post 55 minutes ago by g2gfast
3 Comments - Last post 1 hour ago by hbarkas
55 Comments - Last post 1 hour ago by kctan
32 Comments - Last post 2 hours ago by Kappaking
How do you block the banners that pop up from steam saying "Your friend is playing..." and "Blank Group is having an event"
Thanks
Comment has been collapsed.