I would think long & hard about it.. what is it they say, leapords don't change their spots.... I would have a list of rules & if they don't like that then don't come, maybe only meet once a month & if you can find an alternative place to meet that would probably be for the best... if you go ahead & have at your house, no matter what the rules are there will still be those that do not follow them.. BUT then again there will be plenty that do & you will enjoy yourself... hard decision to make... good luck with them