If you are creating an event post the event in "looking for game"(if needed) first then post it in "submit games to be added to calendar" then use this forum to post the list of players attending.

If you are a player feel free to sign up for any events listed here by posting the name you wish to be called during play and your steam name. be sure to check the "Looking for game" forum as well to better your chances of finding a game.