Issue Summary

If the calendar is created by John, but John is not the first user to create an event he may not receive notifications for future events on that calendar of that event type. 

Steps to Reproduce

1. Login as John 
2. Create a team calendar
3. Login as another user eg Admin
4. Watch the calendar created in step 2
5. Login as Jane
6. Create a new event on the calendar in step 2
7. Admin will receive an email, but john will not

Expected Results

John and admin should receive an email since they are both watching the calendar

Actual Results

Only Admin received a notification of the new event

Notes

When a new event is created a generic local "subcalendar" is created in TC_SUBCALS table 

If the first event is created by John a GenericLocalSubCalendarDataStore and InternalSubscriptionCalendarDataStore are created in TC_SUBCALS table.  However this doesn't seem to happen correctly when the first event is created by Jane.  

Uploaded a screencast here: 

https://drive.google.com/open?id=1ouNyZyIewX70xSNYGMai7Sd79lFM4y0y

Workaround

I suppose it would be possible to export the calendar, delete it and then reimport it.