Have you ever tried to go out to dinner with a party of 20? This is a group of people with presumably the same core value: you all want to have dinner with some friends. So everyone is in agreement on the goal, even if a few guys just go along to make their wives happy...
It is a nightmare. And you don’t have to do it.
The best thing to do is fracture into four or five groups and all go out to dinner separately.