J.R.
Have a backyard carnival. Since you should have plenty of adult relatives there, they can run each of the games. Just think of all the games that are usually at a fall carnival like the cupcake walk, lollipop tree, duck pond, ring toss, or face painting. Give each kid a color-coded ticket to "pay" for each game (i.e. duck pond is blue) for a party favor prize, then they can play as many times later for just candy. The best part of this is that they actually get to play games for the goodie bags. You can even do other themes instead of clown. We had a ballerina carnival for my daughter and hot wheel carnival for my son.