This, it appears, is real, a Fancy Rat Convention in New York, with a Rat Fashion Designer showing off her Rat Fashions in a Rat Fashion Show:
You can find out more from the “small home based rattery” that provided the rats, the Big Apple Rattery. And all I can say is that they’d better not have held that thing in the hotel where I’m staying this week while I’m at a convention. It’s not a rat convention. Officially.