The calendar displays all of the information based on "tags". Each team has a tag, each division has a tag and each key area of the website has a tag.
Click on "Show Tag Menu"
Click on the check boxes that relate to the information you want to see. If you click in the "Show All Tags" box, all of the available calendar events will be displayed. If you click "Show All Tags" a second time, all of the boxes will uncheck. This is a quick way to remove all tags so you don't need to uncheck each one.