The Dimmsdale Convention Center is a building where comic conventions are held in Dimmsdale.
During a comic convention at this building, Timmy Turner visited so that he could see the Crimson Chin in person. However, the Chin turned out to be an extremely overweight impersonator, so Timmy wished up the real Crimson Chin instead, but he saw the people at the convention as villains he had previously faced. Timmy quickly wished his powers gone so he would not hurt the innocent people. When the Chin found out he was not a real person, he became depressed and willingly wanted to go back to his comic book which Timmy grants. Unfortunately because the Chin found out he not real, his spirit was broken causing all of the comics to be canceled due to them only showing the Chin in a fetal position. Timmy then went inside the comic book world to help restore the Chin's spirit. After helping the Chin regain his confidence and spirit regardless of the fact that he was just a comic book character, Timmy returned from the comic book world with the identity and costumed persona of Cleft the Boy Chin Wonder, his entrance and costume allowing him to easily win a contest that was being held.
Cosmo and Wanda were also able to fly around during this convention in fairy form without fear of being discovered, as everyone else simply thought they were in costume. Chester McBadbat and A.J. also briefly appeared in costume, Chester was dressed like a warrior, while A.J. wore a crude robot costume.
Outside, the building is mostly featureless, and is colored white. Inside are several booths featuring comic book heroes and villains. There is also a stage, and a giant television screen.