If only it was that easy! I'm not allowed to share content to or from my work calendar for security reasons. The school and camp calendars are a mix of PDFs and hand-written websites -- a neighbor wrote a scraper to extract the information from a few of them into a caldav at one point but it ended up being even flakier than copying the relevant bits by hand. There's no technical barrier to consolidating my personal calendar with the various family / neighborhood calendars but in practice I have to hide most of the other calendars because the volume of irrelevant events is just too large, so I end up just copying over the relevant events to a personal calendar.