Check their web site or Fandango.
Most if not all new releases will have early screenings on the Thursday night prior to release. This means big names like star wars and justice league whose release dates are displayed as Friday releases will have earlier screenings on the night prior. Since most don't know of these advanced screenings for no extra charge they tend to be quite empty in comparison to the Friday and Saturday show times which will most definitely sell out.
No idea for now
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