Day 20 is: HORSES AND HEADLESS MEN
Day 21 is: PHANTOM FRIDAY
I wasn’t sure what to do for day 20 other than, obviously, the Headless Horseman, so I put it off until I did day 21. I saw “Phantom” and wanted to do the old Hanna-Barbera cartoon of “The Funky Phantom” and looked for a reference. Amazingly, I found a comic book of the cartoon and the cover had the phantom flying away from The Headless Horseman! It was perfect! So I basically copied the thing but made it fit over two pages: