It's not a dining experience but we just had a blast at Dancing With Disney over in DCA this week. Really great interactions, lots of characters including some I've not seen out and about before and a great vibe for the kids.
There were two groups- "Ladies of Disney" and "Mischief Makers."
Ladies of Disney: Cruella, Marie, The Stepsisters, Daisy, Clarabelle and the Queen of Hearts
Mischief Makers: Lilo and Stitch, Terk, Timon, Genie, Big Bad Wolf, Hook and Smee
They aren't doing autographs, but will pose for pictures and are dancing and playing with the kids.
ETA: And it's free.