Use case: I want to make a kind of maintenance list of things that need to be done. Every week, every month, every quarter, every half year, you get the idea. Clean out the dishwasher filters, clean out the washer filters, car is due for oil change, etc.

I could just use any number calendar apps like google and stuff but I enjoy self-hosting my own stuff and owning as much of my own data as possible. Plus I am just having fun exploring FOSS software.

So, does anyone have a suggestion for a self-hosted app—probably a calendar—that can send me a reminder when events approach?

Cheers!

Edited to add, thanks for all the suggestions so far everyone. To be clear, I am specifically interested in self hosted software if only for the exploring and learning experience, but also for practical reasons such as ease of access from multiple devices as well as access for both me and my partner.