on a slightly more serious level than my previous post ... of the ones that ive attended, ive always like the ones that were more a party than an obvious fundraiser. crown and anchor games are fun, but if 80% of the evening's fun involves people forking over cash, that may not be well received.
check into locals halls, like unions, veterans, italian-canadian clubs, etc. im sure there are a lot of smaller german clubs in kw. makes sure the location is convenient, and/or you can ensure safe rides home. remember, you may be legally responsible for people afterwards.
and yes, a trampoline is a must-have.