ZZ Top have announced a 50th anniversary North American tour. The trek will include a number of dates with Cheap Trick and Lynyrd Skynyrd. Tour Dates: Aug. 16 – Ridgefield, WA – Sunlight Supply Amphitheatre* Aug. 17 – Airway Heights, WA – Northern Quest Casino Theater Aug. 20 – Yakima, WA – Yakima Valley SunDome…