Paradox and gents, i think it really boils down to risk vs reward. and you are 100% correct with all your comments. being a business owner, at one time, i had to think about eveything. i carried a million dollar insurance policy just on myself. i think the best way to get around the 'being sued' is to have a business lawyer draft a waiver, that coinsides with the libablity insurance the PO is carrying. i really hope this happens, BUT it will take ALOT work and planning to pull it off.
on the note about -18 and under, i hate to say this but they are where the money is. so i would propose time slots or different days for each age group. ex. weekdays , all ages. friday, saturday & sunday, 9a-2p all ages, 2-6p -18, and 6-11,12ish, +18.. these are just my opinions so be nice everyone!