Akron/Canton Ohio area restaurants for approx 20 people that are fun??

I'm having a Harry Potter release night dinner for about 20 people and I want to be able to reserve a restaurant ahead of time. For example, I know Bennigan's won't take reservations, but I don't want us to be waiting around for an hour to get a table. I need some place that is fun, semi-cheap, and that serves alcohol, but it can't be a bar because a couple people aren't yet of age. Thank you so so much!!