I will never attend MFF again.
For context: they let me book a hotel and make travel plans, then cancelled my hotel because "I used an invalid email" despite my name, address, phone number, credit card info, and unique one-time registration code being correct on the registration form.
They didn't deign to inform us of this cancellation until the day after the hotel blocks went public. So, of course, our room was long gone.
That cost us about $800 in extra hotel and travel expenses. Couldn't cancel (flights were already booked, can't cancel flights for a refund, ouch).
But hey, thanks for giving me a tax reciept two dsys before taxes are due (also, six weeks after I filed mine).