We’ve run events for groups ranging from 5 people to several thousand. Needless to say, whatever you’ve got planned we can handle. In general we recommend groups of 20-ish or less. Smaller games are more demanding of the players and will emphasize skill differences (and how fast people improve at the game) more. Larger games can be a bit chaotic and frantic, but still fun.
For groups of more than 20-25 we’ll most likely rotate players through the game at your event, running shorter, intense games and giving folks the opportunity to take a break now and then. For groups of less than 20 we’ll plan to have everyone on the field all the time, although if someone wants to sit out for a breather here and there that’s ok.