Rumi celebrated at UCLA's Royce Hall with Whirling Dervishes and Turkish Musicians

I went to see Dervishes' prayer-dance a few years ago at my old university.  It was my first time, and  it was absolutely breathtaking. I was deeply moved. Dervishes were celebrating “Wedding Night” of the great mystic poet Mevlana Jalaluddin Muhammad Rumi’s, 13th century Sufi mystic. Here is a great quote explaining the dance:

"We do not turn for ourselves. We turn around in the  way we do so that the light of God may descend upon the earth.  As you act as a conduit in the Turn, the light comes through the right hand, and the left hand brings it into this world."

If you have not seen one, here it is a short video.
I also love The modern vesion of the dancing by Shahrokh Moshkin Ghalam. 

The ceremony/dance is called "Sema".
"The Sema represents a mystical journey of man's spiritual ascent through mind and love to "Perfect." Turning towards the truth, the follower grows through love, deserts his ego, finds the truth and arrives at the "Perfect." He then returns from this spiritual journey as a man who has reached maturity and a greater perfection, so as to love and to be of service to the whole of creation." - Wikipedia