Here are the possible solutions for it happens once in a blue moon clue
Answer
Clue
Relevancy
rarity
Clue
It happens once in a blue moon
Definition
the quality of being rare, also RARENESS
kennyg
Clue
"For his contributions to jazz, ___ should be smeared with bacon grease, placed in a cage with three underfed Kodiak grizzly bears, and whatever happens, happens." ("Genius Guide to Jazz")
