I'd like to suggest a game: DayZ (also known as “DayZ Standalone”)
It's an MMO (I think up to 40 can fit into a server) with a huge area that involves scavenging and avoiding zombies. If we have a few hours to kill after CS:GO this might be a good bet. We could form teams/bands and go roaming around for supplies. It's also possible to play before the tourney and build up your arsenal. The game's now in alpha and costs $30, though that will probably cost more as the development proceeds to beta testing and production. Seems like an awesome game from the YouTube videos I've seen. What do you think?