does anyone have a recipe for a Drupal 8 Views Calendar to show civi events or civi activities
Somebody who is searching for this answer can use the following civcrm extensions. 


  https://civicrm.org/extensions/event-calendar-extension and
  
  https://civicrm.org/blog/totten/experimenting-activity-calendars


I have not tested "Activity Calendars" though.