The Apple Support Communities are an international user to user technical support forum. As a man from Mexico, Spanish is my native tongue. I do not speak English very well, however, I do write in English with the aid of the Mac OS X spelling and grammar checks. I also live in a culture perhaps very very different from your own. When offering advice in the ASC, my comments are not meant to be anything more than helpful and certainly not to be taken as insults.
Since Easter is a Christian holiday, and Eastern and Western Christians celebrate Easter on different dates, you might check to see if your US denomination has a calendar to which you might subscribe. For example, here is one for the Evangelical Lutheran Church in America;
http://www.cph.org/t-resources-diary.aspx
As a Mexican, my iCal is subscribed to;
http://ical.mac.com/ical/Mexican32Holidays.ics
Making assumptions never pays.