I need help! My kids turning 11 in 3 weeks. I'm deparate. Please send me ideas!

have it at like lazer quest or something?

water ballons, sprinkler limbo, movies

You have not told us if you have a boy or girl turning eleven? Have you thought about inviting a friend or two and taking them to a theme park, zoo, all night movie session, skating followed by a movie. You could have a skating party. Another idea is to only invite 5 or so friends and have a slumber party. You then only need to order pizza, have hot chocolate and munchies. You can ask each person to bring their own pillow and sleeping bag and if it is warm enough you can set up a tent (borrow if you need to) in the back yard! Another idea is to invite only 5 and take them all out to a fancy restaurant. On the invitation ask them to dress up and make it a formal but fun occasion. You then take the cake with you and drop the children home after the party!