Locke and Demosthenes? Visit
The cinema is a long and narrow mine, dug deep into an old mountain, a mine so narrow (listen carefully) that watchers fit in only if arranged one after the other, and they have to wiggle a bit to push themselves further. You can't miss the entrance, it's written Transmutations on the arcade above it. Fortunately, you don't have to wait in line, it's moving continuously. And don't worry about returning, there's a permanent exit at the other end of that mine, that's where people get to see the
Aurora consurgens. And there are intermittent exits on the sides too, marked Disparition, you may use them as well.