Ludlow Garage Etiquette?

I’m seeing Eric Hutchinson at Ludlow Garage on Nov 9. I’ve never been, and know it’s a small venue with assigned seating. I have something else (for my daughter’s school) earlier in the evening, but don’t have exact details or times. We are in the ‘burbs, so it’ll be about a 30 min drive to get there.

If my daughter’s school thing butts up against the concert, I would be late, obviously. Is it the kind of venue where I should plan to be in my seat when the show starts because of the assigned seating, or would it be ok to be late and come in during a song break?

I just want to make sure I’m not accidentally being a dick.