Last year the stars would walk up to the seating area and sign over the fences and stuff.
You have to be fast, and have a pen and pad ready, and they only had short time periods to do it.
I heard that after they were done filming though, later in the evening, they devoted more time to signing autographs.
Some people were lucky enough to catch stars like Jason Dolley and Kyle Massey coming out of the elevators and freely walking down the isles of the stadium, that was cool (of course I was out on the grass by the outfield, so I didn't get to them fast enough.)
Last year my friends and I got autographs from: all the Jonas Brothers, Jason Dolley, Kyle Massey, Anna Gausch (one of the international stars), Sabrina Bryan (she is soo nice!), Jake T Austin, and a few others.
We got to see just about everyone though, Maddison Pettis, Sprouse Twins, Jason Earles, Miley Cyrus, Ashley Tisdale, Adrienne Bailon, Keily Williams, Lucas Grabeel, Corbin Bleu, Monique Coleman, Emily Osment, the Rico kid, the guy from Johnny Kapahala, and all of the international stars.
It was a lot of sitting around while they filmed, but the camera crews would come up to the bigger crowds and have us go crazy, and they passed out props and posters (but we brought our own)
It's just a fun time, I loved being out there all day with my friends.
Warning though: DEFINITELY bring sunscreen, and if possible food and water (not sure if you can bring coolers into the WWoS, but I need to find out, because that is the best way, their food/drinks are pricey)
-Sarah