Tim Carbone of Railroad Earth, San Francisco Giants third base coach Tim Flannery, The T Sisters, members of Hot Buttered Rum and more will perform at the 8th annual Nat Keefe Concert Carnival on Thursday, December 19 at The Independent in San Francisco.The Coeds, Jacob Groopman and Melody Walker of Front Country, Rodney & Helen, DJ shOOey of Space Cowboys, Jim Chayka of Supermule and Joe Kyle Kr. of The Waybacks are among the other artist that are set to perform at the event, which will also feature a surprise appearance by a legendary bluegrass singer. The music-fileld variety show—led by Hot Buttered Rum guitarist Nat Keefe—has become a San Francisco holiday season tradition. Tickets are now on sale.