Contrary to popular belief, playing musical chairs at a party isn't very fun. So overdo it on seating. Have extra chairs, and if you're in a tight space, try to think of space-saving alternatives — cushions, bean bags, stools, ottomans, benches. Take into account guests with different abilities too — some people may need a higher seat, or a chair with a backrest, while others can sit comfortable on a blanket or cushion. However you swing it, make sure everyone has a place to rest.