There's a whole bunch of animated holiday specials from the 1970s and 80s that seem to have vanished from the face of the earth. Here's a few of them:
A VERY MERRY CRICKET from the brilliant Chuck Jones is a sequel to A CRICKET IN TIMES SQUARE (both from 1973) that ran on ABC in the early 1970s and later entered syndication before turning up on Nickelodeon in the 1990s. I remember loving it as a kid, but have not seen in about 30 years. Wonder if holds up.