Jonas brothers, concert gettn there earlie?

okay so me and my cuzin are going to a concert in sept, 4th for the jonas brothers. I went to there concert back in march and we wanted to see them and we got there at 5pm and it started at 7pm and we never seen them get off there tour bus our anything. Well i was wanting to know what time should i leave next time to maybe get to see them in sept get off there tour bus and u kno theyll take pics and sign, so if yall could help me out, and the concert starts at 7pm also this time. THanx