An audience i think :)
Barmy Army or Hooligans.
There is no official fan group of offspring.
If you mean Justin Bieber fans, they're called "Beliebers".
They're called 'fans'.
Fans of Pentatonix are commonly referred to as "Ptx fans" or simply "Pentaholics." This nickname reflects their dedication and enthusiasm for the a cappella group, known for their vocal harmonies and innovative arrangements. The community of fans actively engages in supporting the group through social media and various fan events.
People at a concert are called several things:crowdaudienceconcertgoersfans
They are called Raiders fans.
Fans
An audience i think :)
They're called Blackjacks like a card game, which is also called Twenty-one. Dara fans are called Daralings and CL fans are called CLovers. I'm not sure what Minzy and Bom fans are called.
Dalmatians fans are called "dalmates" =]