We would like to see a whirling dervish ceremony while in Turkey - and wont be in Konya nor in Istanbul the days they are at the Galata Monastery. Thank you
Look into the Sarihan Caravansery near Avanos. A quick Google search identifed one vendor who will take care of the arrangements for you (http://www.goreme.com/whirling-dervishes-ceremony.php). I'm sure there are other options for tickets and transportation. One note - I have not seen the ceremony here and can't comment on it. From my most recent visit there (way back in 2009), I recall that the room where the ceremy is conducted is fairly intimate and has portable aluminum bleachers for seating. The caravansery has been fully restored and is also a nice place for an afternoon tea break. Good luck!
On my RS tour the guide told us that all the Dervish ceremonies that are open to tourist are "shows" and not the real thing. We were told that the real ceremonies are religious in nature and not open as a show.
But, bottom line is that you still get to see the Whirling Dervishes - regardless and it is interesting to see.