To post an event to the calendar, simply go to the forum and post a message. You need to start your message body with two very specific lines... (this goes in the body not the subject line)
Date: 5/7/2009
Start Time: 10:00am
Now you can leave off the start time if this is an all day event. And of course, the date would be the actual date of your event and the time (if you choose to supply one) is the actual start time.
Every few hours, our system checks the message area looking for messages with Date: as the very first line and then posts those messages to the calendar. The date must be in numeric format mm/dd/yyyy in order to be included on the calendar automatically.