I used to do this for my late mother, to the point that unwrapping the calendar was a stop point at Christmas (and had to be done early, so that the family could pass it around) and “Ooh, that’s one for the calendar!” was a comment during the year when we shared phone photos.
I started out with ancient techniques, using “calendar kits” that had to be printed at home and then hand-assembled to get the plastic binding through all the pre-punched slots. (Bless ‘em, the kit makers always included more pages than months to allow for printer jams and post-printed errors discovered.)
My mother also appreciated having all the birthdays and anniversaries printed, as well as leaving space on each day for additional events.
And when we went through her stuff after she died, there was a box where she’d saved all her calendars.