Any holiday-- Halloween, Xmas, Thanksgiving, Easter, New Years, 4th, etc. Can be present ones, past ones from your youth, good ones, dumb ones, maybe commercials you remember during or bumpers or previews of it.
Speaking of bumpers, this is what often was shown for the CBS ones:
! No longer available (http://www.youtube.com/watch?v=-4_d_6A8nE0#)
Post away with memories/videos/pictures/etc.!
Death and I loved when they showed Mary Poppins every year on Thanksgiving night.
R.O. BLECHMAN 1960s Christmas bumpers:
http://youtu.be/MUWMjUjit_U (http://youtu.be/MUWMjUjit_U)
http://youtu.be/u-M3AS-76jU (http://youtu.be/u-M3AS-76jU)
And here's a scarce treasure that zips along in 25 minutes, with ALASTAIR SIM:
https://youtu.be/iN6IMZFwY50 (http://youtu.be/iN6IMZFwY50)
MR MAGOO'S CHRISTMAS CAROL (1962)
! No longer available (http://www.youtube.com/watch?v=1JiFO9-Mj-k#)
YOGI'S FIRST CHRISTMAS (1980)
! No longer available (http://www.youtube.com/watch?v=45rO4QEeQbI#)
FAT ALBERT HALLOWEEN SPECIAL (1977)
! No longer available (http://www.youtube.com/watch?v=Klzt8CgtRlw#)