I've seen a little bit everything there, just come early ask questions, have fun.
A rubber band works, I carry some in case anyone would like to use one. Some autos don't bother people, depends on how they eject.
Eyes, ears, shell pouch, if you have one, if not I do, as do others, that you can borrow.
One of our members shoots a 20 Ga, hammer gun, probably 22 inch barrel at the most, you'll be fine.
Lee