Here is a link to a related even that is being held in Redmond, OR. This is the 2nd year for this event. Last year's even got great reviews!
http://www.oregonsummerquiltexpo.com/
As for the Sisters Outdoor Quilt Show... if you plan to come early to take classes before the Quilt show, or are staying overnight... make your hotel reservations as soon as possible!! Hotels fill up very very fast for this event!! The day of the show, plan on arriving as early as possible.... you cannot believe the HUGE traffic back up into Sisters! Our weather here in Central Oregon can get quite HOT in July so plan your wardrobe accordingly. There is always plenty of water stations around which is so nice! Our climate is not HUMID but DRY... except 2 years ago when we had a huge thunder, lightning and monsoon event... lol...
Prepare to be AMAZED at the talent you will see!! Bring your camera, you will want to remember these quilts forever!!
And.. enjoy, enjoy, enjoy!!!!