There are several great films that focus on reproductive rights and that would be a perfect match for your event:
From Danger to Dignity, a film trilogy by Dorothy Fadiman, which historically examines the movement from the beginning of this century until today. The film was produced/distributed by Concentric Media.
On Hostile Ground, directed by Jenny Raskin and Liz Mermin and produced by Catherine Gund/Aubin Pictures -- and I believe distributed by Women Make Movies. This looks at the recent assault on abortion doctors.
That should be a start. Good luck with your event