L.J.
If you are going to make it yourself, keep it simple. Cut up fruit and cut up veggies are enough of an appetizer, and you can leave it out for the meal. I like to make my food ahead of time. Sloppy joes freeze well and I just pop into a crock pot. Last party I bought a pork shoulder (big one) and put it in my slow roaster all day. All I did was shred it and added BBQ sauce. It wound up being cheaper than ground beef and very tasty! BBQ pork sandwiches. I froze and heated up on the day. Serve with chips, your fruit & veggies and either a potato or pasta salad and maybe deviled eggs, jello for the kids and your done. For the little kids I always have some hot dogs in a pot of water for those picky eaters. For simple goodie bags, Making a big frosted cookie on a stick that you make ahead of time and freeze is nice. Wrap in celophane and its a nice parting gift. I also like to give each child one thing that is nicer, instead of a bag of little stuff they lose right away. Maybe a small sports ball or small stuffed animal. You could also give gift books to Wendys or an ice cream store. Bigger kids like those better anyway. Since its June you will probably be outside. Renting a big inflatable is a great idea, but if you can't, getting a bunch of big cardboard boxes and having the kids decorate them. They could try to make them look like rocket ship or big jet. They play instruments on the show, so household items that the kids can make into musical instruments. That could work for a variety of ages. Then have them put on a little show for the birthday child. It's always good to keep them busy with a craft. Even having them frost their own cookie or cupcake with all the sprinkles is a lot of fun. Family Fun on line has a ton of ideas for backyard games that you can make yourself. Good luck!