Found another contest for SDCC! This one’s for those in Australia who are interested in attending. JB Hi-Fi is giving away a trip for 2 with flight, badges, and accommodations included. After making a purchase on their site, you can fill out the entry form here. Contest runs through May 5th.
There are 2 contests for US residents that are still accepting entries until next month. You can keep up to date with them by visiting the SDCC Unofficial Blog contest hub. This site is one of my top sources for any information for the event. Good luck!