For musicians, though, they have to look ahead to get prepared for shows and concerts six months out. For schools, music teachers HAVE to prepare in July for the end of Fall semester concerts. It's just the way things work.
I have been noticing people asking for help and guidance to find new music and programming ideas for their shows. This doesn't surprise me. THERE IS SIMPLY SO MUCH STUFF OUT THERE to sift through. Teachers and Choral Directors have quite a job trying to come up with fresh material year after year.
There is something to be said for having a few numbers on the program that are TRADITIONAL. But, if just for the sake of the long-suffering audience, it is so refreshing to have most of the program different from year to year. That said, you don't want all of the songs to be completely brand new, either. Singing at least a few old favorites helps the audience appreciate the show better.
Some of the Christmas Holiday show THEMES (songs) I have used are "Holiday Harmony," "Be a Santa," "Walking in a Winter Wonderland," "Caroling, Caroling," and "Under the Christmas Tree." Another theme song that became a fun show is "The Greatest Christmas Card in the Whole Wide World." These last two theme songs I actually wrote because I ran out of time searching.
Fortunately at my schools, we did not have to worry about being "politically correct." We just sang a wide variety of songs --- from winter fun songs to Nativity songs, even a few Jewish songs. All were appreciated.