The Con-Conflict

Did you hear? They say the OmegaCon nabbed the guest speaker for tomorrow! What the hell, man?

— Angry Con Goer

The Con-Conflict was a brutal (well...) war between a bunch of different conventions, the result of decades of competition for celebrity guests, ticket prices, and audience members. But it wasn't until the PsiCon announced that they would have none other than Pete the Yeti as a guest that things exploded. Literally.

Nerd Rage

The announcement was met with considerable scepticism by everyone, but it didn't stop PsiCon from marketing the hell out of it. As other cons saw their attendence rates plummet and income with it, people were starting to get pretty angry. It started slow enough, with agents from other cons trying to figure out what the truth was to PsiCon's boost, but that quickly escalated to sabotage, followed by fist fights. When the mutated and malformed Yeti that the PsiCon leadership had cloned escape, accusations flew all around and soon too did the bullets.
By then, corporations had noticed the trends on social media and viral videos of flabby con-goers trying to murder each other in a variety of hilarious (to the viewers) ways. Camera-drones started to show up all over the Sub-Sectors affected by the conflicted and caches of weapons (or weapon-esque things) mysteriously found their way into the hands of various faction. When it looked like one Con was going dominate and end the entire war, an equally mysterious team of elite operatives just happened to murder all of them. Any hope of "cooler heads prevailing" was quickly stopped, too. When Emmy of the YetiCon Day! tried to broker a peace, she was killed by an "accident" when a piano dropped out of a helicopter and crushed her. Why a helicopter needed a targeting laser was never explained.
The war didn't end until public interest (and ratings) started waning. When the camersa turned off, the Law-Corps descended on the trouble-makers like a sack of profit-seeking hammers, and order was restored. PsiCon, the instigator for the entire sad ordeal, is still shunned and despised by the other cons. There's plenty of bad blood and battles still going on, though, and as long as the feud stays profitable, it's probably not going to go anywhere.