If you like guitars and rawk, see all of Queens of the Stone Age. They're among the very best at what they do. Their recent Portland show was one of the best rock shows I have ever seen. Josh Homme is one of the most entertaining front men, and the band is tight. See Queens of the Stone Age with the backdrop of the Gorge (although yeah, it will be dark).
So Sonic Boom is in Edmonton August 29-31, X-Fest is in Calgary August 30-31, and Bumbershoot is in Seattle August 30-September 1. I wonder if Bumbershoot will get any of the previous two festivals' artists. Not Death Cab since they headlined last year (Tegan and Sara also played last year), but some of the other would still be cool, especially Jack White.