Blackie Lawless of W.A.S.P. performs in Barcelona, Spain on Nov. 4, 2017. Photo by Xavi Torrent/Redferns. SAN FRANCISCO — If the 2020s have been getting you down so far, you should have been at the Regency Ballroom on Friday night, because heavy metal mainstays W.A.S.P. and Armored Saint brought…