Yeah, free tier only lets you have 3 total calendars and there is no color coding available so it’s limited compared to Google which is what I was leaving. But export/import was seamless and it seems a good stepping stone to replace the one-click cloud megacorp offerings. Your stack seems perfect for when I have the time to get Nextcloud going.
Not sure about the other but PoppinKREAM became known on Reddit during the Mueller probe for very long, very well researched and cited comments mostly related to politics. Their citation style in particular meant their comments got tons of Reddit awards and were highly visible.