User blog:Sonny Black/Double/triple XP weekends

Last friday night (July 15/16) I noticed they had tripled the amount of XP you could earn when doing gang hideouts. I got 5400 for Pike's Basin while I normally get 1800 or so XP.

However, I couldn't find any info/anouncements about this. Does anybody know more about this and when they going to do this again?