Besides that, pretty much everything “after school” is being arranged over Facebook, as well as community “blogs”, newsletters etc.
Facebook solves this problem extremely well. I still remember the “good old days” of poorly managed Wordpress sites, shared Google calendars, mailing lists, and texts, and I’m not particularly keen on going back to that.
The sad truth is that there is nothing on the market today that solves this problem in a combined package, and you can add discoverability to the mix. If you’re interested in X you can search for it on Facebook and 9/10 times you’ll find what you’re looking for, from menus for restaurants to opening hours. Yes, Google does this as well but somehow people (here) are more aware of the feature on Facebook.