I'm a New Yorker...of Course I Knew That

The Tree Lighting at Rockefeller Center
Every year, NBC produces a live telecast of the tree lighting that also features performances by an impressive line-up of celebrity guests. For the 2009 Rockefeller Center Tree Lighting Ceremony, 30 Rock's Jane Krakowski and Chuck's Zachary Levi.

1931: Construction workers put up the first tree on their muddy construction site.
1933: The first formal Tree Lighting Ceremony, with 700 lights, took place at the new RCA Building.
1936: Two 70-foot trees were lit and the new Ice Skating Pond featured the ceremony's first skating pageant.
1942: Three trees, red, white and blue, were erected to support the WWII troops abroad.
1966: The first tree from outside of the US was erected, dontated by Canada to celebrate the Centennial of its Confederation.
1999: The largest tree in history came from Killingworth, Connecticut.
2007: The tree went “green,” employing LED lights.
2009: celebrity guests included Michael Buble, Aretha Franklin, Alicia Keys, Barry Manilow, The Roots & Shakira.
source: wikepedia