Yello, I wasn't sure if I was allowed to edit Takeshi64's Gameathon post, so I decided to create a new one just in case. This week, I'll be hosting the event. As per usual, the gameathon is to be held on Saturday at 9 PM EST. Just enter chat at that time and we'll plop a link for you to join in.
The form for suggesting games can be found here. You don't need to be attending the gameathon to suggest a game.
More information on how the gameathon works can be found at Project:Gameathon.