Can someone who is under 18 get into an 18+ show if they are accompanied by someone older than 18?

21+ is 21+ I very highly doubt they'll be flexible. Metro's staff is fantastic and if there's any workaround at all they'll know. Maybe contact the promoter and see about them making that artist's next visit 18+ or all ages

Doubtful

21 and older

Might want to call them.

Should i call?

Yes. It has to be a parent i think.

I don't think so