You know what? The other day, my daughter asked me for a tea party. I set up in our back yard, we got all dressed up, and she had an absolute blast.
I think it might be more fun if you transform a room... Get a few spools of tulle, and drape them like a kind of tent. Stream some pastel balloons and flowers along the walls, get a pretty tablecloth (or a sheet from a thrift store...) heck, go crazy and cover the chairs with some fabric and tie a ribbon around the back to make it look fancy. Then get all dressed up. Maybe run out and get some fancy cookies if you don't feel like making them.
This way, you can dress up as "fancy" as you want (my daughter had me out on my bathrobe, because she thought it looked like a princess cape, as well as a dress-up tiara... As much as I love her, no way am I going out in public like that. Lol.) You also have control of the menu, as well as not having to worry about customer service being slow. :)
Just an idea. :)