First-time caucus goer

Tonight is the Ohio caucuses.  These aren't like Iowa's, we're picking delegates for the July convention.

I'm going.  I've never done anything like this before, I just show up on election day to vote.   At least with meet-up, there are pictures and folks happily giving the blow-by-blow on BFA, so I knew what to expect.  The caucus is meeting in a local pipefitter's union hall that I've never been to, and I won't know a soul there.  What can I expect?  Can I sit quietly and observe, or will I be expected to join in debate?

 

Can I wear my Dean t-shirt?