"Celebrate recovery" is a term often used by anybody who can celebrate the fact that they have recovered from an addiction, or are in recovery from addiction.
In most A.A.ⁱ or N.A. the number of days you have “clean” is celebrated by taking a chip or a "Just for Today" chip in N.A, also 30 days, 60 days, 90 days, 180 days chips are used to celebrate. An Addictⁱ or Alcoholic also has a cerebration on a “birthday” when spoken by somebody in recovery refers to their annual sobriety date, and is usually much more significant to them than their date of birth.