You’re not interested in running it with New Mexicon style game pitches for each timeslot? In the years I’ve gone to Forge Midwest, and the one year I went to New Mexicon, I’ve never seen a timeslot come up short for people wanting to run stuff. But if that’s a concern, the way they do it at Gamestorm is to have someone run the pitch who knows the crowd. Attendees are asked to split into people who want to run something in the timeslot and people who want to play. The person running the pitch eyeballs the division, and if it looks to be short of GMs, asks people from the player group who he or she knows to switch over and pitch and run something. “Hey, Jason Corley, can you run something in this timeslot?”