Jason had the honor of being the mascot for Have2Run Production's booth. They were promoting the Superhero Race that happens every October in Cambridge. Here is a blog post from last years run. If you're interested in running/walking this year you can sign up on the website.
The rest of the convention was a combination of artists, characters, collectors, vendors, fanatics, and gawkers (like me). But first everyone had to get in past this guy... the Gatekeeper.
Some groups even took this opportunity to raise money for the charities of their choice. The 501st Legion had a booth where you could shoot various Storm Troopers to raise money for the Shriners Hospital!