The Oklahoma Freewheel is June 7th - 13th more info here - http://www.okfreewheel.com/
The Numb ride June 27th to July 1st. Sounds like a great ride. http://www.numbride.org/
Bran of course - http://bran-inc.org/wp/
Cycle Greater Yellowstone - http://cyclegreateryellowstone.com/