The booth requirement is an old technicality that will be removed in the new EHP update, I believe, so you're fine to charge more.
With regards to event size, I'll just say that if you want to run a big tournament with all the players at once, be flexible on the time or run on off-peak times, like Thursday or Sunday.
Also, don't forget that plenty of people just want to play and don't need a tournament.
Generally, it's easier to find and dedicate space to a relatively small, consistetly running event than something that's big for just a few hours here and there.
Gen Con LLC
Thursday will be FFG's main National preliminaries if they hold true to last year, so I will not schedule anything big that day. I will likely be playing in that event anyhow. I could schedule something late night, like 8-midnight'ish but I think it would be too close to the FFG scheduled event. However, people who do not get into the tournament may still be looking for a game. (Or diehards who just played 8 hours still looking? :)
I can be flexible on timing and I'll run some smaller 4-hour block 3-round Swiss events. Its a nice blend of competition and friendly play with a defined "winner".
My tentative goal is one larger event of 64 people sometime (so that would be 32 tables for about 6 hours), then I would be open to anytime on the any days to run a few more events in the 16-32 player range.
Possibly 5-6 events over the entire convention.
Are Wednesday nights generally harder to find players or just harder to get an event scheduled?