Clicking in day view should create new event
Summary: Ref T8300, clicking in day view should create new event
Test Plan: Open day view, click in an empty slot, new event modal should open.
Reviewers: epriestley, Blessed Reviewers, chad
Reviewed By: epriestley, Blessed Reviewers
Subscribers: Korvin, epriestley
Maniphest Tasks: T8300
Differential Revision: https://secure.phabricator.com/D12990