Crossword Clue:

Happening once in a blue moon

Answer	Crossword Clue
RARE	Happening once in a blue moon
SELDOM	Once in a blue moon
RARELY	Once in a blue moon

SELDOMLY	Once in a blue moon
RARE	Once-in-a-blue-moon
VERYSELDOM	Once in a blue moon
RARITIES	Once-in-a-blue-moon events
RARE	Seen once in a blue moon
RARITY	It happens once in a blue moon
RARITIES	Things seen once in a blue moon.
SELDOMLY	Once in a blue moon, old-style

RARE	Like a once-in-a-blue-moon event