21: The number of weeks since Adele last performed live before vocal surgery.
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Grammy Awards In Numbers
7. 21: The number of weeks since Adele last performed live before vocal surgery.
Adele's last performance before having surgery on her vocal chords was back in September 2011, making it exactly 21 weeks since her last performance or 147 days when she makes return to the stage at this year's Grammys. Ironic given that her critically acclaimed second album is titled '21'.