Try: Settings > Privacy > Calendars, uncheck Facebook
Well, depending on under what account do you have Facebook, i might guess that you need to remove it from there, i.e : if you have configured from Facebook page, you need to go there, otherwise if is related to an gmail/hotmail etc, you might want to see configurations from there.
Not sure what you mean. The calendar was created via the iOS 10 Facebook integration. With the integration gone, I can find no way to remove the calendar.
What 'm trying to say is that ( and here I go with an example) : I had synced previously events from Champions League to my device. With the latest iOS version, even I couldn't find a way to remove it. So this was created by adding the official link to my Google Calendar from gmail.com/calendars and then to have it synced on iPhone. So I was able to remove it only by going to gmail.com/calendars and then to remove the link, restarting device and not seeing it anymore.
Yeah but again, the calendar was added via the Facebook integration. Which is now gone. In iOS 10 I would have gone to Settings->Facebook and turned off calendars. That is now gone.
Under Accounts and Passwords -> Fetch New Data, more remnants of the Facebook contacts/calendar account. Quite the 'miss' by Apple to not clean this stuff up when removing the integration..
As far as I know, there were always "missing stuff or features" regarding to Facebook in general, Apple doesn't quite like apps that are always asking permission about mic, location, camera etc
This is more about Apple removing some low level integration and forgetting to clean up after themselves completely. Hoping 11.0.1 addresses it.
There should still be a Settings > Facebook option, just grouped with the other installed apps. Is it in the permissions there?