Anyone have experience holding film screenings?

I would like to hold a few film screenings in my city. As I was about to email the production company, I realize I have no clue how to do this...

Should I contact theaters beforehand? There are a few theatres that I know will hold these kinds of screening, but I was hoping to possibly do the screening in one of the large university lectures halls (because it would facilitate a panel discussion). Are there questions beyond the terms and the price of the of the screening license that I should ask the production company?

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If anyone has ever organized something like this - any advice would be appreciated. FYI - this is for a documentary that is only available via special screenings and I am in Canada and the documentary is from the United States.