By Brandy McDonnell Features Writer bmcdonnell@oklahoman.com As if fireworks, live music and more than 100 visual artists weren't enough, Helen Mirren, James Franco and a swashbuckling band of pirates are joining the merriment at the 37th Annual Arts Festival Oklahoma. Plus, Oklahoma City Community College has Benedict Cumberbatch waiting in the wings. During this year's Labor Day weekend festival, which annually draws more than 25,000 art lovers to the south Oklahoma City campus, the college is launching its foray into National Theatre Live, joining more than 1,100 venues around the world in broadcasting productions from Britain's world-renowned National Theatre in London.