There's also clauses about MA games not being allowed to be "demonstrated" in public places, whether that applies. And it's always iffy in a large event like this to ensure minors are being monitored by a guardian for the entire duration.
Not to mention having restrictions on age means they don't need to censor people (*cough*cod players*cough*) to ensure an environment where minors would be exposed to foul language etc. regardless of their guardians trying to manage what they're exposed to...
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