Possibly related: I note that my macOS calendar has simply been failing to notify many of the alerts that I have set, and I have been late for meetings, etc, as

Possibly related: I note that my macOS calendar has simply been failing to notify many of the alerts that I have set, and I have been late for meetings, etc, as a result. I can watch some events pass with the calendar open and no alert arrives. Sometimes I do get alerts. This has been going on maybe a few weeks?