By the way, the calendars are free.
Here are a couple of handy calendars to get you started.
NFL Playoff Schedule (updated as the playoffs progress)
California Golden Bears Football Schedule (updated as games are added and changed)
Moon Phases
Note: when you click those links you’ll be taken to iCal, where a box will appear asking you some questions about this new calendar that you are about to add. The key: tell the calendar to REFRESH every day (or at some other interval). You want it to refresh because you want updated information. For example, the NFL Playoff calendar as of this writing shows that San Diego beat Indianapolis in overtime, and that Arizona beat Atlanta. Very nice.