How I sync my Remarkable and my online calendar.
I’m still enjoying my Remarkable Paper Pro. It’s part of my early morning routine: I use it to write morning pages, read books and the newspaper, and plan my day. It’s simple and does what I need it to do. I also love how they improved how it renders color with a recent firmware-upgrade.
I also use it for calendaring. One tool that’s been especially helpful is Remarcal. It keeps my PDF planner on the Remarkable synced with my main calendar on Proton Mail. Since I don’t take my Paper Pro everywhere, I often add appointments on my phone. Having everything in sync makes it much easier to stay organized.

Remarcal offers a few templates for the yearly, monthly and daily view including some basic notes pages. It keeps my notes when updating the PDF.
One caveat is, that I needed to put the Remarkable into developer mode, so that Remarcal can access it via SSH. Syncing works over USB-C. At least for me this is far more workable than manually keeping my online calendar and my Remarcable in sync manually.