STEP NINE (Viewing Only Your Custom Calendar)

If you just want to see your son's karate schedule, in the Calendars list on the left side of the iCal window, Option-Command click on the checkbox to the left of the calendar's name, and you'll instantly see when your son's karate classes are, as all other calendars are temporarily hidden from view. (Note: To view all the calendars again, Command-click on any unselected checkbox to the left of a calendar that's hidden.)