Mary-Catherine Deibel, at 72; UpStairs on the Square co-owner was ‘unofficial mayor of Harvard Square’

As co-owner of those Cambridge restaurants — both now gone, both missed by diners — she was a legendary presence at the front of each establishment, a hostess everyone remembered long after UpStairs on the Square closed at the end of 2013. Get Today’s Headlines The day’s top stories delivered every morning. Ms. Deibel, whose […]

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