In a similar vein, check out reTerminal. Using battery powered devices with eInk screens that will last for months before needing a recharge. The screen is very customizable, and very easy to implement a calendar into.

And you can DIY reTerminal devices too. I already had a 7" eInk panel that I was able to convert with an ESP32 to eInk adapter.

https://www.seeedstudio.com/reTerminal-E1001-p-6534.html

[–] AnarchistArtificer@slrpnk.net 2 points 2 weeks ago

Oooh, very cool. Thanks for the link, I'll check it out