How to mark days in the taskbar calendar that have events so that they stand out from others that don't?

[TheRealHowtobasic]

It's hard for me to really explain it any further, like, just have it show with a different colour on that specific day so I don't need to click on it to know something is there.How do I do that, and if not possible, how do I replace the taskbar calendar entirely?

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