Don't mean to rain on your idea, but if money changes hands for food you are catering, vending, or something similar.
Carry's with it some legal requirements.
May I suggest you read some of the many threads here about catering and such until someone comes along with other ideas.
"Flirtin' with Disaster" BBQ Team (RETIRED)
FBA and KCBS Cook and Judge.
Former owner of a WSM, a Smokey Joe, a Charbroil Commercial gasser (junk), and the legendary "StudeDera".
Now cooking with a FEC100, a Traeger Lil' Tex, and a Fast Eddy PG500
Proud Pellet guy cooking on real wood.