All ride invitations posted in the forums are added as quickly as possible, and are added manually by Troy as the community makes him aware. For example, ride invitations posted in the Ride! forum will be added to this calendar.
The calendar is read-only. You can click the "+Google Calendar" button at the bottom to add to your own Google Calendar view. You can also add individual events to your calendar.
If you'd like to discuss the calendar or have questions, you can do so in this thread.