Fan Conventions are where fans flock to. Criminal Conventions attract criminals. Here you can find all that you need for your everyday criminal activities. Galleries presenting new top of the line stabbing knives, vendors selling fashionable leather lampshades, vivisection demonstrations, friends who understand just where you're coming from and guest starring Charles Manson and Jeffrey Dahmer! Contestants of the Mad Science Fair get a free admission. No cops are welcome.
Supervillains, serial killers, terrorists, black-market dealers and so on usually come to these conventions and share with one another. They are usually kept in secret (unless "supervillain" has a different connotation in the world it is set in), requiring a special password or invite to be accessed. More often, the conventions usually go on without any sort of incident, anything explosive or disruptive would be fashionable and expected from such an establishment. It almost wouldn't be a convention without a casualty or two.
- In The Sandman #14: The Collectors, a convention of serial killers and mass murderers congregate to share stories and conversation. Here, rogue nightmare and serial killer, the Corinthian, is found attending the convention, having been an inspiration to many of the serial killers attending. The various attendants go by code-names, the convention called a "Cereal Convention" as to not draw attention to themselves. The convention comes to an end when the eponymous sandman Dream is called there by one of their victims and then proceeds to destroy the Corinthian and show the conventioners how petty and meaningless they truly are.
- While three different superheroes (Daredevil, Spiderman and Wolverine) were after him, The Punisher once massacred a meeting of just about every sample of American organized crime (biker gangs, triads, Russians, and Mafia) who were holding an auction of a captive Bruce Banner. Frank lures the heroes into a position where they're the first thing Bruce sees when he Hulks Out.
- In Minions, villains, supervillains and petty criminals flock to Villain-Con where they can showcase their inventions, bounty and is where the minions go to so they could find a villain to work for. The minions learn of it from a secret television broadcast and are set to Orlando, hitch a ride with a bank-robbing family and eventually meeting with famed supervillainess Scarlet Overkill.
- The opening scene of Tomorrow Never Dies has James Bond infiltrating an Arms Fair run by terrorists.
"It's like a terrorist supermarket. Chinese Long March Scud, Panther AS-565 attack helicopter... a pair of Russian mortars, and the crates look like American rifles. Chilean mines, German explosives, fun for the whole family."
- The ANNUAL TRANSYLVANIA CONVENTION from The Rocky Horror Picture Show might count as the guests are all alien agents from the galaxy of Transylvania. The only one we see do anything bad is the host, Dr Frank N Furter who murders out of jealousy and turns people into statues.
- Analyze This starts with a Distant Prologue involving the Real Life meeting of The Mafia mentioned below, and a new secret meeting is an important plot point and the setting of the film's climax. The comparison between the two meetings (as explicitly said by one character: on the '57 one, it was to see how the Mafia families would split the United States among them, while the new meeting is to discuss how the Mafia will survive in a world full of increasing disloyalties, Stupid Crooks amongst the "made man" ranks and Ruthless Foreign Gangsters) is also mentioned.
- In the Saturday Night Live sketch "World's Most Evil Invention", a convention is held for Mad Scientists to show off their most evil invention that they plan on terrorizing the world with. One such scientist - Roy (played by Dwayne Johnson) - invents Robochomo, a cheap and easy to manufacture robot designed to molest children. While the villains all agree that it is the most evil thing they have ever head of, they are all more horrified and disgusted than impressed.
- Atop the Fourth Wall: Discussed in the Spawn/Batman review when Linkara mocks the plot point that random low-level drug dealers are somehow doing business with agents of a foreign dictatorship:
Linkara: Oh yeah, I'm sure impoverished drug dealers do trades like this all the time with former dictators. They meet at the Evil People Conventions and exchange business cards.
- Shaggy Dog Stories Episode 35: An Apple a Day has an evil princess attending the Notorious Villains' Ideas Extravaganza.
- In the Kim Possible episode "Bad Boy", there is the Annual Supervillain Tradeshow and Convention. They have henchmen seminars, doomsday demonstrations and an evil snack bar! Unlike most examples of this trope, the general public seems to be aware of this, the convention taking place at the Middleton Convention Center.
- In South Park, Butters visits a pimp convention when he accidentally becomes a pimp.
- One Spongebob Squarepants episode features all of Mermaid Man and Barnacle Boy's villains meeting in a hotel... it turns out to be a book club.
- A Real Life version of this trope did occur. On November 14, 1957, the Apalachin Meeting was a historic summit of the American Mafia held at the home of mobster Joseph "The Barber" Barbara, in a small town called Apalachin, which is not far from Binghamton, New York. It was set up by Vito Genovese, Charles Luciano's former Number Two, who aimed to wrest control of the Luciano (now Genovese) family from Frank Costello, his Arch-Enemy and to become the Mafia's overlord after eliminating Albert Anastasia, the boss of the Mangano (now Gambino) family a few weeks before. Around 100 mobsters attended the meeting, but it turned into a big disaster when a curious state trooper got wind of it and sent in reinforcements. Many mafiosi eluded capture, but more than 60 of them were caught including Genovese himself; others nabbed include Carlo Gambino, Paul Castellano, Frank DeSimone, Giuseppe Profaci, Santo Trafficante and Joe Bonanno (who claimed that he wasn't there at the meeting despite being caught by state troopers at a nearby cornfield; he was there to talk about his recent meeting with Luciano and a narcotics pipeline he set up with the Sicilian mob a few days earlier); Tommy Lucchese, Carmine Galante, Carlos Marcello and Sam Giancana themselves eluded capture, while state troopers found clothes belonging to Stefano Magaddino (a cousin of Joe Bonanno and the boss of the Buffalo mob at the time) stuffed in a car, thus indicating that Magaddino may have been there but managed to avoid arrest. Genovese was blamed for this debacle, and he ended up in prison for presumably trumped-up charges on narcotics trafficking in 1959. And not only this, the fiasco exposed the American Mafia in front of intense legal and public scrutiny in later years.