I had the amazing opportunity to sing and play the flute in the lighting ceremony for the Washington DC temple lights this year. The Mormon Choir of Washington (of which I am a member) was asked to sing at this special even on Wednesday and Thursday (Nov. 28 & 29). They didn't tell us who the guests would be, although we did find out that it was by invitation only.
President Boyd. K. Packer
Elder Dallin H. Oaks