Hosting "public" film events that include non-MSU people has different rules from using films in classes, orientations, or other events that are restricted to MSU people only.
Contact the MSU Libraries Office of Copyright for further questions on copyright/licensing and film events.
Some films that the MSU Libraries has purchased or subscribed to come with PPR, so those can be shown to a group for no extra work or cost. Search the Library Catalog (Books and Media) for films from these vendors:
The following vendor's film *do not* come with public performance rights (and therefore must be sought and payed for per individual screening):
All major streaming distributors for which MSU Libraries supplies access are on the Library's Media page: http://libguides.lib.msu.edu/eresources/media