This is a Sundance-centric review only:
I've been attending the Sundance Film Festival in Park City for the last 12 years and the Egyptian is consistently one of my favorite venues! It just doesn't feel like Sundance until I have a midnight screening here! This is a cool old theater that has that cool old theater "smell," a gorgeous exterior facade, and creaky floorboards that add to the overall ambiance.
The movie screen is a good size for the space, the sound system is just right, and the seats are reasonably comfortable (the armrests are horrible, though). During the festival they sell beer, wine and liquor (!!) along with snacks (super nice after a long day of screenings and attending theaters where you can't take food or drinks inside)! The floor has a steep slant but that doesn't keep people's heads from blocking your view. Try to sit in the front row if you don't want to see heads throughout the movie.
Note that the restrooms are downstairs and require climbing a quite steep flight of stairs. Don't even think about trying to park here during the festival; take the free shuttle bus if possible or be willing to shell out at least $25 to park in the garage across the street.
My #1 most important tip if you are seeing a Sundance screening here is to dress in WARM LAYERS! You are required to line up in the alley at the side of the theater (which sometimes stretches out around the building and out in the elements). As such, this can get VERY COLD, even when it's not snowing. So please, dress appropriately!
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