There are several reasons that could lead to this problem however, fixing the same is not such a daunting task. Issues with the Calendar app: The Calendar app installed on your PC might be facing issues that need to be addressed. Latest Windows 10 Update not Installed: You could also face the issue if the Windows 10 installed on your PC is not updated to the latest version.
Outdated Calendar App: It might be possible that the Calendar app on your PC is not up to date, causing it to crash.