I finally found a write-up of this fan event, and it was even more amazing than I had first thought, with a full day that started at Universal Studios with a ride on the Transformers ride to get people in the mood, and then over to Paramount Studios for a tour and a look at the vehicles and props... and finally in the afternoon they were driven over to Michael Bay's Platinum Dunes facility for a meetup with the director himself to show off the post-production process of what was filmed, and then to a nearby IMAX theatre that had been reserved for the special preview screening.

Just be aware of spoilers though as there are details about the 20-30 minutes of movie footage included in the report.

So jealous.

Also... the 20-30 minutes of preview footage, will be screening at several selected IMAX theatres in North America on April 4th, for free, and fans are to reserve tickets through a special website.