In the upper room of the Temple in Jerusalem. The Savior laid his hands the heads of his Apostles and gave them the Gift of the Holy Ghost. Many gifts of the Spirit were manifest at the conclusion of this meeting.
Great question! :)
The descent of the Holy Spirit upon the apostles is commonly referred to as Pentecost, and ocurred in Jerusalem:
While meeting with them, he [Jesus] enjoined them not to depart from Jerusalem, but to wait for "the promise of the Father about which you have heard me speak; for John baptized with water, but in a few days you will be baptized with the holy Spirit." Acts 1:4 NAB. (see also Acts 1:8, 12)
Also, during his speech at Pentecost, St. Peter widens his address to other on-listening citizens of Jerusalem, indicating that he is indeed speaking in Jerusalem:
You who are Jews, indeed all of you staying in Jerusalem. Let this be known to you, and listen to my words. Acts 2:14 NAB.
REFERENCES
Confraternity of Christian Doctrine. The New American Bible, (Iowa Falls: IA, World Bible Publishers, Inc. 1991).
Pentecost occurred 50 days after Easter. See Acts chapter 2. The Holy Spirit rushed upon the Apostles (and maybe other disciples? I am not sure) and the Blessed Virgin. It is also the birthday of the Church.
The day of Pentecost is the day that the Holy Spirit ( The Promise of God the Father ) came in the upper room and the Apostles received the Baptism of the Holy Spirit.
The holy spirit came to the disciples , in the upper room, on the day of Pentecost.
All of the disciples were filled with the Holy Ghost on the day of Pentecost, and 3000 were added to the Church on that day.
The holy spirit came down and the disciple start speaking in tongues
3000 were added to the Church on the day of Pentecost.
After the day of pentecost the apostles witnessed to the people, they were bold and filled with the holy spirit an spoke in tongues, please note not sounds but in different languages , and the people were amazed
Pentecost.Pentecost.Pentecost.Pentecost.Pentecost.Pentecost.Pentecost.Pentecost.Pentecost.Pentecost.Pentecost.
The modern Western equivalent is 9am.
Jesus did not meet the disciples on the day of pentecost.
The fiftieth day after Easter (7th Sunday) is Pentecost.
Pentecost is celebrated as the day the Holy Ghost was sent to the Church.
The Easter season is followed by the Pentecost season, which begins on Pentecost Sunday.
Indeed, Pentecost and Mother's Day fall on the same day this year, 2008 (on May 11).
It is important because Pentecost is the day the Holy Ghost was sent to the Church.
Pentecost Sunday is always the 50th day after Easter.
All of the disciples were filled with the Holy Ghost on the day of Pentecost, and 3000 were added to the Church on that day.
The Holy Spirit came to the apostles on the day of Pentecost. He filled them and they began to speak in new tongues.
Roman Catholic AnswerThe Sunday after Pentecost is Trinity Sunday.
No. Christmas Day is the day we celebrate Jesus' birthday. Pentecost is the day the Holy Spirit came upon the disciples.
It is important due to the historical event occurring on that day; but most important is that Christians receive the Holy Ghost, as occurred on the day of Pentecost.