Panel from "Halloween Pranks of the Bizarro-Supermen" in Adventure Comics #294 (March 1962), script by Jerry Siegel, pencils and inks by John Forte
You know, I'd expect a Bizarro calendar to have more imaginary numbers and symbols, like May the Fish.
Because knowing is half the battle, you can read more about this wacky story in "Bizarro Back Issues: The Existential Dread of Halloween on Bizarro World" by pal Chris Sims on the late, lamented (but maybe soon life-bring-back-to) Comics Alliance . Remember: everything you knwo about Bizarro World is wrong. Because that am not way Bizarro World ain't.