If you’re under 18/21/whatever and you’re going to an all ages show, do you still need ID at the door? Or is it just for people who are going to be at the bar? If you do need ID, does a school ID work for people under 16?

Yes

When I was there last month, they told everyone who was over 21 to get their ID out if they were planning to go to the bar. Then they stamped the wrist for everyone who was over 21.

Only an id to drink alcohol.

At the bar

They're only gonna ask for ID at the bar if the event is labled all ages, you don't need one to get in the door.

Just for the bar area.

You don't need an ID at the door, but you need an ID for the bar at the back.

The only reason you'll need a valid ID here is if you intend on going to the bar area and balcony.