Question: The irish folk group that collaborated on Celtic Woman: A Celtic Family Christmas was formed in what city?

Context articles: Celtic Family Magazine
Celtic Woman: Silent Night
Celtic Woman (album)
Celtic Woman: Believe
Celtic Woman: A New Journey
Celtic Woman: Destiny
The High Kings
Celtic Woman
Celtic Woman: Voices of Angels
Celtic Woman: A Celtic Family Christmas

Celtic Family Magazine was a Los Angeles, California-based print and electronic publication, serving Celtic communities and their descendants around the world.
 "Celtic Family Magazine" published special features and articles on art, history, culture, entertainment, and lifestyle.
 "Celtic Family Magazine" was produced by A Raven Above Press and was distributed throughout North America and select areas of the United Kingdom.
Celtic Woman: Silent Night is a Christmas compilation album by Celtic Woman.
 Along with "", it was released on October 9, 2012.
 This is their first album to be distributed by EMI Music Christian Music Group (CMG Distribution), initially an exclusive CD available at Christian retailers.
 It has since become available through other outlets.
 "Silent Night" features a brand new song, “The Light Of Christmas Morn,” performed by Chloë Agnew and Lisa Lambe.
 The other tracks have been drawn from their first Christmas album "A Christmas Celebration", which was released in 2006.
Celtic Woman is the eponymous debut album of Irish singing group Celtic Woman.
 The members of the group were first featured on a PBS musical special of the same name.
 With the help of the said special, Celtic Woman reached #1 on the World Music charts within weeks and remained there for a record 81 weeks.
Celtic Woman: Believe is the seventh studio album by the group Celtic Woman released on 25 May 2011.
 This album was intended to be released exclusively in Japan to promote the film "Princess Toyotomi".
 This is Celtic Woman's first album to feature their newest member (at the time) Lisa Lambe.
Celtic Woman: A New Journey is the second on-stage production by the group Celtic Woman.
 The show was filmed at Slane Castle in County Meath, Ireland and featured Hayley Westenra as a new addition to the group.
 The album was released on 30 January 2007.
 This album broke a long-standing record when it surpassed the 81-week run of the original "Celtic Woman" album.
 The Celtic Woman performers change their outfits at least three times.
Celtic Woman: Destiny is the tenth studio album by the group Celtic Woman.
 This is Celtic Woman's first album to feature their newest members Mairead Carlin and Éabha McMahon.
The High Kings is an Irish folk group formed in Dublin in 2008.
 The band consists of Finbarr Clancy, Brian Dunphy, Martin Furey and Darren Holden.
 By June 2016, the group had released four studio albums, two live albums, and two live DVDs.
 Their first three studio albums appeared at number three or higher on the "Billboard" world music chart, the first two went platinum in Ireland, and all of their albums charted in Ireland.
Celtic Woman is an all-female Irish musical ensemble conceived and created by David Kavanagh, Sharon Browne and David Downes, a former musical director of the Irish stage show "Riverdance."
 In 2004, he recruited five Irish female musicians who had not previously performed together: vocalists Chloë Agnew, Órla Fallon, Lisa Kelly and Méav Ní Mhaolchatha, and fiddler Máiréad Nesbitt, and shaped them into the first lineup of the group that he named "Celtic Woman", a specialty group.
 Downes chose a repertoire that ranged from traditional Celtic tunes to modern songs.
Celtic Woman: Voices of Angels is the eleventh studio album by the group Celtic Woman.
 "Voices of Angels" features vocalists Susan McFadden, Mairead Carlin, Éabha McMahon, and fiddler Tara McNeill, with former member Méav Ní Mhaolchatha as a guest.
 This was Celtic Woman's first album to feature their newest member Tara McNeill.
Celtic Woman: A Celtic Family Christmas is a collaborative album by the group Celtic Woman and The High Kings, released on October 14, 2008.