What to send with a screenplay when one sends it to a literary agent?

So I recently went to a writers group based in Los Angeles. I had approached them with a screenplay I had written, revised, and repeated twice--and they were extremely enthusiastic about it. Tomorrow a few literary agents are to come to the meeting to scout new material from many of the writers who attend...What am I supposed to include along with the screenplay? I've already typed up an overview and treatment...Is there anything else?