Think about children. Are they going to be allowed on the site, will their parents let them 'off the leash', will they romp all over the dance floor tripping up doddery oldies? Are you having events for accompanied / unaccompanied kids, how will you avoid losing them (NOT taking them in a crocodile through Whitby harbour is a good start - that was 25yrs ago though)?
A warning to parents in the programme may alter some parents ideas, at least it protects you from some of the risk of litigation.
And alert the stewards to possible risks and what actions should be taken - e.g. if stewarding an outside display should they stop unaccompanied children climbing on a wall?