Perfect.  Again, I really do appreciate your help.

That worked and I can't thank you enough.  Now, if I want to add more specific holiday information, like the first seder, Purim, etc, how would I do that without adding duplicates?

I followed the directions; however, hebcal does not show up as a calendar and that is part of the problem.  Being frustrated, I went to each duplicate event and deleted one of them. The screenshot I have attached shows in March 2025 an example of duplicate events. My goal is to delete all of these events and just add Hebcal in Settings for the Calendar on my Mac computer.