From Holly “Windstalker” Longdale‘s twitter:

Double Guild XP Weekend starts tomorrow at noon PST! Game on! #EQ2

— Holly Longdale (@WindstalkerEQ2) February 28, 2013

and from the EQ2 Forums:

We are running a Double Guild XP Weekend starting tomorrow at noon PST until Sunday, March 3 at 11:59pm PST.

Or should I say, Double XP weekend for Guilds…