Can you host a family gathering of around 20?

I can't be 100%. But they have a large back room separate from main dining area. It would be best to call and see

We have mini reunions there every few months. They have a room you can reserve for larger parties. Service is still great as always even in the private room.

Yes in back room

I can't say with any certainty if they can but I would imagine they could, they have large rooms. I would call them and ask about reserving a room and a couple of tables for such a large party.