How can i meet the Jonas Brothers/Demi Lovato at Hershey Park Concert?

I'm going to the Jonas Brothers/Demi Lovato concert in Hershey Park on August 14th, 2010 and I want to know if there is a way I can get meet and greet pes to meet either the jonas brothers or demi lovato. Also are there any tips on how i can meet them not a meet and greet (like around their tour bus, other places in the venue, etc.)? If anyone has meet them before, it would be great if you shared your tips and experiences on how you met them! Thank you!