Dds are turning 11 soon. They want a big party (inviting around 40, boys and girls- assuming quite a few won't make it). I've never let them do a whole grade party and since it's the last year of elementary we are going to do it. At roller skating rink. We haven't had a party in ages - do I still need party favors? If so, what is a good/easy suggestion for fifth graders?