a number of fair points. best point: agree with avoiding the big lunch groups as those conversations can get carried away.
on the other hand, i am a big proponent of setting up lunch meetings with one other individual. you can plan ahead what you want to discuss, and more than anything, you open yourself up to their entire network. think about how powerful that is!
i guarantee they know at least one person "you should meet..."
at the same time, don't force a lunch meeting when there's always plenty of quality videos to watch or reading to be done during a break.