Because it's a solar calendar. Month's are merely a convenience. That would be like celebrating a new hour because it's more often than a day.
People who use the lunar calendar, however, do celebrate each new month. And considering there's a few billion of those people, it gets its fair share.
In reply to Re^3: This year I'm most looking forward to ...
by chacham
in thread This year I'm most looking forward to ...
by Arunbear
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