Plain text calendar template

I have been enjoying my CAL.md, a plaintext calendar, for a couple months. I have only used it for personal reminders as the family calendar, single-source-of-truth is a traditional wall-hung month-view calendar; no chance of changing that! I still like my own plaintext file to keep track of a few things, especially finance, birthdays, and such. I tried the very basic one line per day approach per…