The three-part 9/11 commemoration ceremony hosted by the BOK Center features a performance by a community choir, representatives from 12 faith traditions, words from local speakers and a video presentation. Former Tulsa Mayor Susan Savage will serve as keynote speaker. A first-responders street expo and concert starts outside along Third Street between Frisco and Denver at 3:30 p.m., featuring the music of Eric Himan, Little Joe McLerran and Red Dirt Rangers. It's all free and open to the public. <a href="http://www.bokcenter.com/default.asp?bok=227&objId=680">Learn more at BOKCenter.com</a>.