How were they invited? Through the parents or through the kids? Both??
I would have your kids ask their friends if they are coming. A kid, if they want to do something, will remind the parent.
This has happened to everyone. I remember one horrible party I threw.
Be calm and let the worry go.
Post Edited (Myself 09) : 5/15/2015 10:27:55 AM (GMT-6)