If you're not in northeastern Oklahoma for the entire month of June, you're missing out on a lot:
The International Route 66 festival is in Tulsa this year, June 10-13. Should be a great party, and a great way to learn about this important pathway through 20th century American history.
Bartlesville's annual OK Mozart festival marks its 20th anniversary from June 12-19. The family concert this year features the author of the "Hank the Cowdog" books and a performance of Carnival of the Animals. There are chamber performances, piano concerti, and the outdoor concert at Woolaroc. You could even sneak in a side trip to the wonderful Kiddie Park.
Then there's Light Opera Oklahoma, the annual festival sponsored by the Gilbert and Sullivan Society, this year featuring "HMS Pinafore", "Three-Penny Opera", and "Guys and Dolls". The fun lasts all through June, and includes a couple of road performances of "HMS Pinafore" in Okmulgee and up Route 66 at the beautiful Coleman Theatre Beautiful in Miami.
Why spend June anywhere else?