By Brandy McDonnellRock fans know that Tulsa's BOK Center has been the place to be this week, with Guns N' Roses bringing their blockbuster globe-trotting "Not In This Lifetime Tour" to the Tulsa arena Tuesday night and Foo Fighters steering their "Concrete and Gold Tour" into the BOK Center tonight.Those two formidable rock 'n' roll forces joined forces Tuesday night when Guns N' Roses invited Foo Fighters frontman Dave Grohl to join them on stage because, as Axl Rose, put it, Grohl "just happened to be in the neighborhood.Read more on NewsOK.com