The last of the three "premiere" screenings happens in Chicago in the next day (on the 20th over there, which would probably be early tomorrow morning here), and a giant floating stage has been built, and towed next to the Lyric Opera house, where the screening will take place.

Obviously to keep the barge as light as possible, the three vehicles they have on it are all inflatable - Optimus, Barricade and Drift.

There are photos and video clips here... it would have been a sight to see that things slowly making its way along the river in the middle of Chicago.

Marketing cost for this movie is going to be huge, with three big premieres instead of the usual one.