By Denny Dyroff, Entertainment Editor, The Times Sometimes, bands have names that can be confused with names of other bands. Tempest, which will perform on April 6 at New Hope Winery (6123 Lower York Road, New Hope, http://www.newhopewinery.com) is one of them. The band that is playing in Bucks County tonight is Tempest, a band from the San Francisco Bay area that specializes in Celtic rock. It should...