Inkspot] Title of a piece of music? No
irach - Alexander's Ragtime Band? No

Time for a summary? The answer is a group of people with something in common, mostly male. The 'something in common' has connection with rock music, and takes its name from a specific human, but it's not a group. Questions about this involving religion, sexual activities, and being dubious have all drawn giggles or sniggers from the audience. It's not a relationship by blood, or connected with the military (though there was a connection once - sorry, should have noted that earlier), or a charity organisation. It's sometimes done for money, and it may well involve drinking. There's no connection with a particular time of year, and only a jokey connection with journeys.
Writing all that out makes me think that it's glaringly obvious, but perhaps I shouldn't be cruel ;)

Rosie - Elvis impersonators? YES! So as Rosie was the question-setter before me, the baton is returned to sender.