Kanopy offers films with public performance rights (PPR) can be used for extracurricular events, like film clubs or social events.
You can find these films on the Kanopy website by applying the "Public Performance" filter to search results. Scroll to the bottom of the filters and toggle "Public performance rights available" on. Note that this toggle will not appear if the search results contain no films with PPR.
Films with public performance rights have a "PPR" icon next to the running time on the details page.