Calendar Man Riddle Arkham Knight. In drescher’s underground, head towards the dead end, past eillengers, turn right and there’s a secret room which the calendar man has. Calendar man was spending the year celebrating alternative holidays, like world peace day and groundhog day, but decided that he couldn't resist.

There are a total of ten different riddles to. I think the only riddle i gave up finding myself and searched online was the calendar man one.