Here is a Cultural Literacy worksheet on the idiom “Once in a Blue Moon.” This is a half-page worksheet with a three-sentence reading followed by three comprehension questions. As the reading explains that a blue moon occurs only “about every thirty-two months,” students will be able to understand that this expression means the same thing, where people are concerned, as “Long time, no see,” or “I haven’t seen you in a month of Sundays.” Where events are concerned, students will infer that something that happens “once in a blue moon” doesn’t happen very often, and is, arguably, a rare event.
If you find typos in this document, I would appreciate a notification. And, as always, if you find this material useful in your practice, I would be grateful to hear what you think of it. I seek your peer review.