By Denny Dyroff, Entertainment Editor, The Times Garrison Keillor Garrison Keillor will bring years of experience to the stage at the Sellersville Theater (24 West Temple Avenue, Sellersville, 215-257-5808, www.st94.com) on October 2 – experience as a storyteller, a poet, a narrator, a broadcast veteran and an amiable all-around entertainer. On July 6, 1974, Garrison Keillor hosted the first broadcast...