I don't have any idea's since I have two boys. But when my niece was 5 she had a huge castle blow up thing for the backyard and the class was invited. When she was 6 she had about 16 girlfriends over to spend the night for a spa night. They were up until 1am painting nails, pedicures and manicures, facials etc. She just turned 7 last month and my SIL told her no more big parties so she took her and two friends, her brother and his friend and the parents of one of the girls out to dinner at the Outback. Then the girls spent the night.