you can have a liability disclaimer on the ticket or on a sign on the wall but its not worth the paper its written on.
Our Irish Ceili society ran into this issue last year when the hall where we regularly play asked us to sign a liability waiver, each time we book.
We do have a liquor license and serve beer and coolers etc at events
so this complicates things. Basically if someone has an accident on the way home, and gets injured or injures someone - you can bet the Hall, the society, possibly the bartender will be sued.
My brother is involved in a printing craftsman society - they buy event insurance for the year - I think its about $75 Canadian per event, mentioned a case where another society had golf & dinner event, someone drank too much, crashed on the way home,and sued the society and its directors and they had to pay $30,000 each (they didnt have event insurance)