We've implemented a dedicated Game Calendar that let's you keep track of campaigns, sessions, offline messages and GM announcements. It's available at this link. Please note that you need to be registered and logged in to take advantage of the calendar.
We consider the service to still be in a beta phase, which means we may make modifications or need to run maintenance on it from time to time in the coming weeks. We also welcome any suggestions and feedback.
The calendar, we hope, should supercede much of what is currently taking place on this board. We will leave the board up for now, at least until we have all the kinks worked out of the new system and everyone has had ample time to move their campaigns into the Calendar. Still, this board might be merged, moved or removed at a later time.