How do I add holidays?

1) Holidays can be added to iOS as a subscribed calendar and it will show in Agenda. The below assumes you're looking for U.S. Holidays...

Settings.app->Mail,Contacts,Calendars

Add Account

Other

Add Subscribed Calendar

Enter the following and tap "Next"

ical.mac.com/ical/US32Holidays.ics

2) Alternatively, if you're using Google Calendar, add the holiday to that calendar, by following these instructions followed by Google.

http://www.google.com/support/calendar/bin/answer.py?answer=37098