Adds details to Calendar event feed titles
Summary: Closes T8340
Test Plan: Verify that calendar event feed titles have more detail that before.
Reviewers: lpriestley, #blessed_reviewers, epriestley
Reviewed By: lpriestley, #blessed_reviewers, epriestley
Subscribers: epriestley, Korvin
Maniphest Tasks: T8340
Differential Revision: https://secure.phabricator.com/D13352