Stone Temple Pilots and Live both released foundational post-grunge albums in 1994. Now, the pair is preparing for a headlining North American tour to celebrate the 30th anniversary of their respective hit albums Purple and Throwing Copper. The trek with support from Soul Asylum and Our Lady Peace will begin in Concord, California, on Aug. 16, and end in Indianapolis on Sept. 15. Presale events will begin at 10 am local on Tuesday, March 19. Tickets will be available to the general public on Friday, March 22. Purple and Throwing Copper made it to No. 1 on the Billboard 200 and album charts aro…