We are having a semi-formal reception outdoors with 100 people. It is not a buffet; it is a sit down dinner that is served by waiters. I don't want to do a seating chart other than reserve the wedding party table, a parents table, and a kids table (if we have enough). I think people are adults and should be able to sit where they want. It will hopefully encourage mingling too. But people are really split on whether or not there should be a seating chart. Thoughts?