Las Pegasus Unicon, or Unicon for short, was a brony convention held in Las Vegas in 2013
It was meant to be a 3 day convention. The organizers were inexperienced in hosting conventions, although experienced in running scams, but that's a different matter.
The organizers got Tara Strong, John De Lancie, and several other big names from the show to attend, including several musical artists who worked on the show.
They (allegedly) nearly killed Tara Strong by serving her eggplant, which she's allergic to.
On the 3rd day, the entire convention collapsed. The convention only pulled in around 1200 to 1500 attendees, and had promised one of these Unicon pamphlets for every attendee to advertisers.
from what I and a few other people who attended the convention were able to piece together, it is likely that the organizer, Sandi Haas (fake name, don't know what her real name is/was) didn't pull in enough money through the convention to cover all costs including paying for the talent who had showed up. In an attempt to keep the convention solvent, or maybe because she had some sort of gambling addiction, she entered a blackjack tournament on the second day of the convention in the casino that the convention was hosted at, and lost.
A lot of attendees who had shown up from out of state had booked hotel packages through the convention. These packages offered discounts to attendees on rooms booked at the hotel.
When the hotel realized that they wouldn't be getting the money they were owed for the convention and hotel rooms from the convention, they double and in some cases triple charged attendees for their rooms. This left a lot of attendees stranded in Las Vegas with no money until they were able to resolve the problem.
I lived in Las Vegas at the time and so suffered no such ill effects. It was sort of like being on the hindenburg with a parachute.