We do this with a raspberry pi and a decent lcd screen in a picture frame in our kitchen. I like the idea of e-ink but there isn’t a reason to go that route if you want to see everyone’s calendar color-coded while also saving a few bucks.

Love the artistry and dedication in this effort - getting something just right for your own tastes and honing it over time can be really fulfilling.

You can get multicolour e-ink displays.

Still expensive though