I'm so glad Cafe Bourbon Street, 2216 Summit St., is back in business, for its calendar always seems to offer something of interest on those summer nights when nothing much is going on. Tonight that means Dexter Romweber, the man behind rockabilly rabble rousers Flat Duo Jets, will bring his new duo to town. Bobo booking manager Lou Poster is obviously very excited about this one, so perhaps you should be too. The show starts some time after 10 p.m.