Events keep disappearing on the Calendar App

[ShawArt]

Hi everyone,Last week I got around to adding all my classes and other things I need to do to the calendar app on my computer, and they all appeared, but the next day they were gone. I tried adding them again, and they have disappeared once again. This is making it really hard to keep track of everything I need to do. Could someone help me?Note: I am using a Surface Pro from 2017, and I set the sub topic as Mail because there is no option for the Calendar.

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