May 9 is National Sleepover Day, originally founded in 2017 as a collaboration between Cosmopolitan magazine, makeup and skincare company bareMinerals, cosmetic retailer Sephora, and model Olivia Culpo in order to promote one of bareMinerals' then-newest products by hosting a large slumber party in Times Square, New York City.

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National Sleepover Day (Days of the Year)

See also

• May (month)