To the best of my knowledge, the Assumption has been a Holy Day of Obligation since 1950. It was in 1950 that Pope Pius XII defined the Assumption as a dogma of the faith. It has always been believed, but it was never defined before 1950. When the Holy Father raised it to a dogma, I assume that he also made it a Holy Day of Obligation. My A Catholic Dictionary was published in 1957 so it mentions the Assumption along with the fact that it is a Holy Day of Obligation.
Yes, August 15. Officially this is considered a Holy Day of Obligation, but the US Bishops have abrogated the requirement to atttend Mass for certain Holy Days that fall on either Saturday or Monday, and Assumption is one of these. Thus, in the US there is no obligation to attend Mass on the Feast of the Assumption in 2009.
That is lost in history. The Catholic Encyclopedia of 1912 mentions that the Feast of the Assumption on 15 August was one of the principal feasts in Rome as of A.D. 700 and that it has always been a "Double of the First Class" (the old ranking of feasts - this was the highest possible rank) and always a Holy Day of Obligation.
All Saints Day, Christmas Day, The Feast of the Epiphany, and the Assumption of the Blessed Virgin Mary are the holy days of obligation in South Africa. The Lent season and the Easter seasons are the other great days.
There are several feasts and solemnities regarding Mary. The following are Holy Days of Obligation: the Solemnity of Mary, Mother of God (Jan 1), the Solemnity of the Assumption (Aug 15), and the Solemnity of the Immaculate Conception (Dec 8).
The most important feast days are called Holy Days of Obligation.
In the United States many Catholics celebrate 3 holy days. These holy days consist of Solemnity of the Virgin Mary, Feast of the Assumption, and Solemnity of All Saints. If you would like to learn about additional holy days in Catholicism see the link below.
No, but December 8 is, the feast of the Immaculate Conception
Most parish Catholic Churches have a vigil Mass for all solemnities that are Holy Days of Obligation, if they fall on a weekend. During a weekday, it would depend on how much demand there was for such a Mass.
The Triduum, Holy Days of Obligation, and Feast Days of Martyrs
St. Patrick is the patron saint of Ireland and his feast day is a holy day of obligation for all Catholics in Ireland.
Roman Catholic AnswerSt. Patrick's Day is a Holy Day of Obligation for Catholics who live in Ireland as it is the feast day of their patron saint.
The three holy days of obligation of the Virgin Mary are:January 1 - Solemnity of Mary, Mother of GodAugust 15 - The Assumption of MaryDecember 8 - The Immaculate Conception of Mary