With the passive-aggressive nature of the letter, I would have New Year's, MLK, President's Day, St. Patrick's Day, Easter, Cinco de Mayo, Mother's Day, Memorial Day, Father's Day, 4th of July, all family member's birthdays, Labor Day, Halloween, Veteran's Day, Columbus Day, Earth Day, and any other "holiday" light shows. RGB lights are so useful...

That said, being the bigger person is never the easy thing to do. I would find out what the
real issue is and try to resolve it. Sounds like you've been pro-active with voiceovers and show times. Some things are beyond your control - what kind a car someone drives or the condition of their exhaust system. There was another instance of a disgruntled neighbor mentioned on another board. The neighbor shined a spot light in the guy's window. So the next day, he bought a 6-pack and went across the street and talked to the guy. Come to find out, there was a light that was shining just right on the neighbor's window that it was annoying to the neighbor when he was in his recliner. The light show owner re-positioned the element, no more annoying light, happy neighbor.
It's a delicate situation for sure!