Dante's Inferno, Canto XI

"You've cured me of my thoughts, just like the sun can cure the day of night, and made me healthy. Thank you!!! Now I'm happy like a book or patch of grass."

Proposed: Counter-Halloween

Presumably, if Halloween is the day each year when "the veil between the worlds is thinnest," there must exist somewhere in the calendar its opposite: a day when the veil between