Here’s a trick I use for events that happen at the same time every year: I write them in the Notes booklet in the back of my planner. This keeps me from having to sift through my planner every year when it’s time to transfer recurring dates to my new planner.
I use a page for each month, with a line for each date, and write in important things that happen on that date every year like birthdays, anniversaries, insurance renewals, etc. Things that must be done sometime during the month but not on a specific date go at the top of the page.
For birthdays and anniversaries I add the year so I know which age people are turning or how many years of marriage the couple will celebrate that year.
Below you can see an example:
Each year I transfer my booklet over to my new planner, and use it to fill in these important dates.