The calendar was previously only available to admins and mods, I've opened it up to regular members now.
Please use it wisely.
Your use of the the calendar should be for a specific event with a day and time. You can only post events that will happen within the next 60 days.
Create a new topic and then scroll down after you post it and you should see a button that says Cal. linkage that will link your topic to the calendar. You can also hit the events tab on the navigation bar and hit add new, that will also create a topic here that you can then edit to add info on your event.
Enjoy and ask any questions you may have about the calendar here.
