According to “The History of American Bandstand” by Michael Shore with Dick Clark, Neil appeared on the show on Saturday, September 17, 1966, and sang “Cherry, Cherry”. A clip of this turned up on one of the “American Bandstand” anniversary shows.
Incidentally, by the time that Neil made his 1966 appearances on the show, it was being done in Hollywood, not Philadelphia, and it was only being shown on Saturdays, not weekday afternoons.
— Regina Litman