Feast of the Immaculate Conception (December 8, 2011)

The Feast of the Immaculate Conception celebrates belief in the Immaculate Conception of the Blessed Virgin Mary. It is the patronal feast day of the United States and Philippines, celebrated annually on December 8.

Feast of the Immaculate Conception 2011
It is celebrated by the Roman Catholic Church as well as a few other closely related Christian churches.

The Eastern Christian Church first celebrated a feast of the Conception of the Most Holy and All Pure Mother of God on December 9 perhaps as early as the 5th century in Syria.

The Feast of the Immaculate Conception is a public holiday in Andorra, Argentina, Austria, Chile, Colombia, East Timor, Equatorial Guinea, Italy, Liechtenstein, Macau, Malta, Monaco, Nicaragua, Paraguay, Peru, Portugal, San Marino, Seychelles, Spain, Vatican City, Venezuela, and in the Catholic Cantons of Switzerland.

In some countries, though December 8 is not a public holiday, their respective Episcopal Conference declared this day as a Holy Day of Obligation, as it is in Ireland, as well as in the U.S. and Philippines; the latter two countries also recognize it as a patron saint.

On a lighter note, ‘concepcion’ is the Spanish word of ‘conception’ which in this subject is referred to as fertilisation.

Reference: Wikipedia.org