PHOENIX - It started out in a small room at the Mesa Convention Center but now it's one of the largest conventions of the year.
Phoenix Comicon is this weekend and organizers are predicting upwards of 70,000 people.
The event has grown so big that it's now expanding outside of the convention center.
3rd Street in between Monroe and Jefferson Streets will be closed throughout the weekend for a classic comics car show.
Inside of the convention will still see most of the action.
Vendors and exhibitors started setting up booths on Wednesday. Phoenix-based illustrator Daniel Davis will be featuring his Steam Crow brand.
"Books, prints, magazines, buttons, we are going to have all kinds of stuff that we illustrate and design," said Davis.
Davis has been coming to Phoenix Comicon for more than a decade. He says it's grown into one of the premier events in the country.
"It's just exploded. You know at first when I would tell people about this event they would just say they were going to go to San Diego instead. Now so many are coming here that I don't have to convince people," said Davis.
Comicon officials said one reason the event has grown so quickly is because of volunteers.
More than 300 volunteers help put the event together. Kelly Ambrosia took several days off from work to be here.
She said she volunteers because she loves comics, and because of all the things you can see.
"You see it all here. Cosplay, the different authors, guests and everything. There is no end to the awesome," said Ambrosia.
Phoenix Comicon runs through Sunday night. A full schedule of guests and events can be found here: http://www.phoenixcomicon.com/