I want to see that movie... Move here and we can go together! :-)
You show up, go to the concierge or ticket area, show them the letter, explain what you are there for, and ask for the manager. Then you do all that again. :-) You go to the theatre roughly 20 minutes ahead of time, as if I recall right, you need to get a count of heads or seats, but I could have that mixed up with another one I have done for them. You write down the trailers they play, and you note if the audience laughed, snored, etc. Results MUST be input before midnight.
Some managers will let you stay free; others won't.
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“Lying in bed would be an altogether perfect and supreme experience if only one had a colored pencil long enough to draw on the ceiling."
~Gilbert K. Chesterton