Mastodon Show?

swizzlenuts

i'm sciencing as fast as i can
Apr 21, 2003
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Arkham
Mastodon is finally coming to Iowa, and they are playing 10 minutes away from I live. The thing is they show is a 21+ show, and i am only 17. Earlier they had Cephalic Carnage play there and it was an all ages show. I find this really dumb and do you have any ideas on why it is a 21+ show?