SOUGHT advice... Wow.
A large proportion of the punters will be performers, even if not very good ones. Have lots of 'Open Mikes.'

One of the worst jobs is the gate-man's. Turn them over.

Presell tickets (at a discount) for cash-flow.

Ban dogs, cats, and all other animals.

My favourite event is at the Auckland (NZ) festival. A popular and large man brews lots of home-brew, and the event is called 'the Homebrew and Drinking Songs Workshop' Timing is after an evening concert and beer is free! It sounds dangerous, but I've never seen a serious drunk and the singing goes on until everyone's had enough singing, about 4 am. The beer runs out when the beer runs out, and the Traddy singers have a particularly good time.