A short hop south to Franklin is all it takes to get to the area s biggest and baddest non-alcoholic all-ages club. Not your speed? Maybe not, but for countless kids who can t (or won t) get into the beer bars, Logos is a godsend. When you are packed elbow-to-elbow with a mass of 249 other teen-agers, undulating in time to dance beats, who cares if you can t get past the doorman at the Vogue?