Thank you to everyone for pointing out the drag queen reading sessions.
I should have copied the post I was responding to:
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It's interesting reading the comments, one person says they think the intent was to "humanise" drag queens so that kids aren't scared when they meet one in public.*
So my question should have been, when other than these storytimes would a child run into a drag queen. After all drag queens are performers, and often involves adult humour or highly sexualised performances.
I genuinely don't understand what the point of drag queens reading stories is meant to be.