If you want to see your choral Event or Festival on the calendar, just create a Google+ Event or a Google Calendar Appointment and add to your guests the email@example.com.
Also, if you use Google Calendar you can add the Greek Chora Festivas to your Calendars by manualy adding firstname.lastname@example.org or just clikcing the bottom right button .
Your event is important to include the following information:
- Title of the event
- Place (city and venue)
- Time (Date & time)
- Fee of entrance / participation
- Website for extra info (if there is one)
- Basic Details (organiser, participants, choirs taking performing).