I was wondering about the use of "celebration" more along the lines that Greg mentioned. There's a religious ed curriculum used at a former parish titled, "We Celebrate!", which I don't recall ever used the word "sacrifice", at least there was no emphasis on the "Sacrifice of the Mass". It does seem to me that the "party" connotation of "celebration" is more commonly used in our culture, and the meaning in the church documents of "carrying out a rite" is lost on the common Catholic.
I do think there is one fallacy with your question/post, though- it assumes that people are "doing liturgy" based on one faulty premise about it's nature, and that if people changed their premise, we would see better music and liturgy.
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