[DonRotolo]

I don't have the costs, but here are some factors to consider:

Venue costs (do you have to 'rent' the gym?), including the costs for any special protection (Monty Madness, for example, bought ~100+ sheets of masonite to protect the gym floor & 25 rolls of tape to hold it together)

Field rental costs (Ask FIRST about that)

Promotion costs (advertising, posters, printing, etc)

Cost Of Sales (buying the food & drinks, for example, including cups, plates, forks, napkins...)

Volunteer costs (feeding them, t-shirts, etc)

Don