at the risk of sounding cliche...celebrate the reasons behind the holiday. They actually MEAN something, were established and observed for a reason other than drinking. Interesting histories, traditions etc. And taking time to find that out can be fun...and gives us a chance to figure out what they mean to us. How we fit into the larger picture of life, our culture and heritage.
And you might find other days and things to celebrate as well. Things that make you feel real and connected, that ground you or set you soaring. Things that are worth pausing for and honoring.
One of the older terms for holidays was to "observe" them or to "keep" them...if the word celebrate in your life has come to mean "drink"....try on one of those other terms.
Congrats on your clean time and Happy New Year.