Easily half the other events on the calendar are kid-related. Of course it's going to infer that, absent other direction, the most likely overarching theme of the visible events is "child care".

Then why doesn’t it infer it when it’s two male names?

And yet it doesn’t when it’s male names. https://imgur.com/a/9yt5rpA

Sure, but the LLM needs to prove that it can make inferences as well as or better than a human, in order to be useful. Aside from that, it's not human, so there's no need to be fair - it should do what we tell it, not decide on its own.