“When an uptight accountant agrees to spend Christmas with his fiance’ and her parents, he ends up in the last place he would ever want to be, a new age hippy commune, and must learn to accept their free spirit lifestyle or escape and risk losing his future bride.”

Good points all around, I think I could use 'holidays' instead of Christmas and have the title be 'Hippy New Year' instead of 'Hippy Christmas'

The winter solstice could work. Xmas is the ancient Roman holiday Saturnalia baptized as a Christian holiday. (Nobody knows when Christ was actually born.) The Roman holiday celebrated the passage of the winter solstice; days would start getting longer instead of shorter. The Saturnalia was quite a time for booze and bawdy merriment.

But most people won't get the reference or will be confused. So for the sake of simplicity, I chose rite of spring.

The winter solstice could work. Xmas is the ancient Roman holiday Saturnalia baptized as a Christian holiday. (Nobody knows when Christ was actually born.) The Roman holiday celebrated the passage of the winter solstice; days would start getting longer instead of shorter. The Saturnalia was quite a time for booze and bawdy merriment.

But most people won't get the reference or will be confused. So for the sake of simplicity, I chose rite of spring.