I'm off those two weeks as well, so I can (probably) participate! Whee!
There are a lot of respectable free-to-play and inexpensive multiplayer games to choose from. Some that come to mind are Loadout, FireFall, World of Tanks/Warplanes, Guns of Icarus Online, AirBuccaneers (if we can get a good number of people together), AirMech among dozens of other MOBAs... The list goes on and on. I've played most of those myself and/or for my channel and find them quite fun.
In addition, the Don't Starve Together closed beta should be opening up soon to everyone who has signed up. I don't know if they're still taking apps but that could be a deadly good time.