N = Night of Nights
I thought this was fascinating: "The Night of Nights is celebrated annually every July 12. It commemorates when the last commercial Morse code transmission in the U.S. was sent. Many years ago messages, usually in Morse code, were transmitted by radio waves.
Through the efforts of the Maritime Radio Historical Society (M.R.H.S.), West Marin’s historic Morse code radio station KPH returns to the air for a day and transmits in Morse code from 5:01 pm to midnight. Listeners wait to hear the signals of the great station once again fill their receivers. Many will join the M.R.H.S. at the receiving station at the Point Reyes National Seashore to marvel as the signals are transmitted by hand using vintage telegraph keys."