Arriving late to a concert

I want to buy tickets to the Yellowcard concert for next March. The problem is it starts at 7:00pm but I wouldn't be able to make it until 8:00.

I'm just wondering what is the usual protocol at venues with letting people come in late?

The gig is at Studio Coast and there is a supporting band playing first. I understand I wouldn't get a good spot but it's the farewell tour so I really wanna see them!!! But I don't want to waste money of tickets if they have a rule about this sort of thing...

Has anyone experienced this or could share their opinion?

Thank you.

No problem.
You can enter when break btw song and next or talk part.
Concert staff helps you.

I happened to recently sit near one of the doors at a concert hall. During the first 30 minutes or so, there were a couple of people who came in late one by one, and the staff member at the door let them wait there while a song was going on (there was a single chair near the wall), and then showed them to their seats during the next talk segment.