NEW YORK Mariah Carey is the Queen of Christmas for a reason — and not just because “All I Want for Christmas Is You" tops the charts seasonally. Carey has turned the song into an event, regularly hosting Christmas concerts to celebrate her undisputed smash and long career as a holiday icon. This year, she embarked on the “Christmas Time” tour, a variety show that kicked off on Nov. 6 in Highland, California, hitting many major North American cities, before concluding on Dec. 17 night at