User blog comment:DragonDude83/PE Proposal: Calendar Man (Arkhamverse)/@comment-1894820-20190619114555

Absolutely. It's also said that the other Gotham villains don't take him seriously due to his fondness for only killing on holidays, but he is truly demented. Total yes for me.

Surprised you didn't mention his Flag Day (June), Independence Day (July), and St. Roch's Day (August) crimes.