M.C.
I don’t think you are asking a lot, I'm sure if you give the parents enough notice it could be ok. If the parents have a bit of an issue with it...why not go for Ice Cream right after school, you can do something small and quick at Cold Stone or Dairy Queen. I was at a local Cold Stone one day and a family of at least 20 was there for a little girls 3rd B-day and they seemed to be making a big deal about it. And you could still do dinner with the family. I hope this helps and I hope it all works out for you both!!