What time in advance of a show should you get there if you have GA tix? When do the doors open if the concert is listed for 8PM?

Doors usually open 1hour before the start time. If you want a seat in the bar you need to be earl than that.

I went last weekend and people had been lined up 2 hrs before and they were a half hr late opening the doors

Hour dude.

1 hour before the show

1 hour

Yup I would say around an hour too

Hour before.

It depends on if you want to be front row or not but generally an hour before the show.