Thanks for your replies! So most people keep record of past events. Which is sensible, I guess. I find myself (partially) cleaning up every now and then, but mostly because 1. I keep track of family events (kids’ school appointments, …) which I really do not care about once happened; and 2. I abuse my calendar as a todo list, which [often] requires reshuffling … aaaand which is probably a bad practice, but that’s a different topic.
For people who care about, support, or build Free, Libre, and Open Source Software (FLOSS).