ICal Calendar – Using AppleScript how to get the calendar’s server address

You can enter events to specific calendars by holding down the + button

See here the entry from iCal help:

Add events to a calendar

You can add any kind of event to your iCal calendars. For example, you can add meetings, doctor appointments, and family activities. You can’t add events to a calendar you subscribed to.

1. Open iCal
2. Click Add (+) at the top of the iCal window or press Command (⌘)-N.
   Events are added automatically to your default calendar.
   If you want to choose a different calendar for the event, hold down the Add button (+), and then choose a calendar.
3. To change your default calendar, choose iCal > Preferences, click General, and then select a calendar from the Default Calendar pop-up menu.

To set single alerts on all birthdays, you can avoid a script altogether:

1. Open Calendar Preferences in Calendar.
2. Under General, tick "Show Birthdays calendar".
3. Under Alerts, set an alert for "Birthdays".

I haven't taken the time to actually write up an AppleScript for the double alarm parts, but this article seems to cover scripting calendar alarms quite nicely. I would imagine you would just need to create a file or list in the script that contains the names of the events (which you can deduce from the standard naming convention Calendar app uses).

Also I am using Mountain Lion with Calendar app. I can't recall if the steps above work on older versions of iCal.