Subscribed calendar shows up on list of calendars but the events are not shown.

Check your settings for Calendars on your iPhone to see if it is checked to view. Open Calendar, at the bottom of the page tap on Calendars, then see if there is a checkmark by the subscribed calendar.

I would turn off Calendars on the iPhone in iCloud. When it prompts to save or delete, delete. Power cycle your phone. After it has started back up again, go into iCloud and turn calendars back on again.