We actually arrive in town on the 21st but we'll be staying at the Park Hyatt Paris-Vendome until the 23rd. I would love to get together with others, and I'm sure my sister would as well.
It's been a few years since I've been to Paris but one of my favorite restaurants was always L'Epi Dupin. I'm not certain they could accomodate a large crowd, nor am I aware of their current prices. It was always reasonable in the past.