I don't know, but that me be trying to plan too much. I'm only saying this because, if people don't show, it could have an adverse effect on your "good time".
I agree with Jen. Just winging it might be a better idea. OR, just a pick a few people at a time and see if they'd be interested in eating another meal with you.........2 people for one meal, 4 people the next, 3 people the next, etc. Make sure they know that they have to commit to this if they're interested......due to PSs.