Honestly I don't remember how the number came to be associated with it, but people just use the day to be more brazen about using it. Maybe get together in public spaces or with friends. There are probably festivals somewhere, but it's technically illegal in some places too.
I just wouldn't be surprised if Newt chose 4/20 on purpose to be funny.
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I just wouldn't be surprised if Newt chose 4/20 on purpose to be funny.