Mac Calendar quits unexpectedly
My calendar was working fine yesterday, today it opens momentarily then closes and tells me that it quit unexpectedly. I click the reopen button and the process repeats. My calendar works fine on my mobile. I restarted the computer and the computer works fine. I upgraded to macOS High Sierra 10.13.6 recently. No other changes that I can think of. Please help.
MacBook Pro 13", macOS 10.13