Alternative name for the Feast of the Annunciation - or for Billie Holiday? (4,3)

I believe the answer is:

lady day

(Other definitions for lady day that I've seen before include "Nickname of Billy Holiday" , "March twenty-fifth" , "Feast of the Annunciation, March 25th" , "March twenty five" , "festival" .)

I've seen this clue in The Guardian.

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