I can see the new Subscribe button but I seem to have lost the Add an event button when in Month, Week or Day view, it is still there in List view.
The Calendar app only shows the 'Add an event' button in the list view - the other views have a '+' button next to each available day/time which you use to add an event in that specific slot.
The buttons to add events only show if you're logged in as an administrator, or a user/member who has 'Contribute' permission on the Calendar.
Thanks
Joe