This post is about automatically setting up an iCal alarm for your events. This way you don’t have to manually add an alarm. Its rather simple to implement and can save you a couple of seconds when adding a new event.
To add a default alarm, go to iCal > Preferences >General from the menu bar. This will load the preferences for iCal. Within the options take a look about half way down for an option that says “Add a default alarm”. Check the box and add a time in the text box. The alarms are set in minutes, so if you want an alarm set for the day before enter 1440 minutes.