You have way more advanced needs than I have for a calendar, but I've also been thinking of using a self-hosted solution. The realization for this came when I s

You have way more advanced needs than I have for a calendar, but I've also been thinking of using a self-hosted solution. The realization for this came when I started noticing all kinds of appointments by email came with a notification attached to add the event to your calendar. I'm talking Gmail here, and I suppose my smartphone was going to add it to my standard Android calendar or something (I didn't try). Then I realized I didn't even like the UI/UX of my standard Android calendar. I only need to manually add some appointments per week (not even every day, I'm a lucky guy) and realized I do not even need a grid layout for my calendar. Having worked with times and dates in my favorite programming language already, I feel confident I can make something simple based on the standard default classes. Even running something as simple and important as a calendar through third-party apps has started feeling very strange the last years.