Get up and move is the best thing to do, there was an article on HN with the correct algorithm for this but cant find it.

Having a follow up email with everyones contact helps a ton.

I've also given people a prompt of what the question is to ask to get the convo started when people move around. Let people focus with 2-3 people listening mostly to the story of one person.

Many friendships/teams started from these tips!