Click "Customize Calendar View" to the top left of the calendar to select which calendars you'd like to view (once the menu is open, click the pencil icon next to "Calendars" then "add/remove").
What do the colors mean? Each event is categorized by a color. After clicking "Customize Calendar View," click the pencil icon next to "Categories" to see each color's corresponding category. Deselect the categories you don't wish to view by clicking the "x" next to the category's name. Maroon is RHS; Orange is RMS; Yellow is IES; Green is RES; and Red is WES.
Click the green "iCal" icon to the top right of the calendar for directions on how to sync this calendar with your device(s).