It looks like there might be a bug with the reminder messages. I have discovered that in the reminder messages, custom field (e.g. location, venue, room) information does not appear. In the confirmation message all the inforation is displayed correctly, but in the reminder message the same fields are missing. Has anyone else had this issue? I am using Moodle 2.2.2.
Here was a test I did today:
The confirmation message
The reminder message: