In anticipation of their 20th birthday celebration later this year, Cartoon Network is starting the party in San Diego this July at Comic-Con 2012.  Their special guests will include panels for Regular Show, Adventure Time, Star Wars: Clone Wars and the animated series based on DreamWorks Animation’s How to Train Your Dragon titled, Dragons: Riders of Berk. For those of you who aren’t able to attend the con, Cartoon Network will also be hosting the “Big Fan Weekend” on July 14th and 15th where they will show first looks and sneak peeks at upcoming shows.  There are plenty more shows where that came from, so be sure to hit the jump to check out who else will be gracing the halls of the San Diego Convention Center this July 12th through 15th.