"Placebo Day" is the unofficial holiday for fans of the rock band Placebo, held annually on 2 May. Its origin lies in a lyric from the band's song "The Bitter End": "We're running out of alibis/On the second of May."

The original group to have started this holiday seems to be the LiveJournal Placebo fan group "placebowhores" (placebowhores.livejournal.com) although it may have originated elsewhere.
"I'm going to listen to 'Nancy Boy' all day long this Placebo Day!"
by prettygolucky May 4, 2006
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