User blog comment:Golivera/Multiplayer event - Red Dead Redemption- ! Julio 27/@comment-99.23.238.233-20120727152654/@comment-3455248-20120727175750

The triple XP is for everyone. The official event is for PSN only because Rockstar alternates between PSN and XBL. The next event (not yet announced) will most likely be for XBL.