My friends and I compiled some useful links for those attending (or not attending) San Diego Comic-Con 2013.
Friends of Comic-Con International Forum — The unofficial forum for SDCC.
Tehlilone’s Compiled List of San Diego Comic-Con 2013 Exclusives — Incredibly complete and arguably more useful than what CCI posted on their own site.
Outside Comic-Con — Compilation of events and food trucks surrounding SDCC 2013. Some are paid admission or may require a pre-registration for a free ticket.
deviantArt’s Official Comic-Con Group — Mostly promoting dA’s involvement in SDCC.
Cosplay.com San Diego Comic-Con Forum — Seems like most groups or gatherings at Comic-Con get assembled through other networks but there are a few themed groups coordinating on Cosplay.com.
Any my own small contribution, a Cosplayers Twitter List. Just a handful of cosplayers and cosplayer related Twitterers who may (or may not) be at Comic-Con, but it’s a start.