Place a 
by clicking in the Join column box next to the Events you want to join. If you have already joined an Event but want to cancel out of it place a by clicking in the Cancel box next to the Events you want to cancel out of. Then scroll down and click on the “Process My Joins and Cancels” button.
To see a full description of any event go through the Calendar
If you do not see a box in the Join column for you to click on go through the Calendar and add yourself to the Waiting List, we need to open up another table