I just found out (from a poster in another forum) that you can enter an event in Calendar and then, when you see the details, click Repeat to choose how often the event will be repeated. "Yearly" is one of the options.

Jon

macOS 11.7.10, iMac Retina 5K 27-inch, late 2014, 3.5 GHz Intel Core i5, 1 TB fusion drive, 16 GB RAM, Epson SureColor P600, Photoshop CC, Lightroom CC, MS Office 365