In Spain there is a tradition of eating 12 grapes as the clock strikes midnight on New Year's Eve. Each grape represents a month of the coming year with the sweet grapes indicating a good month, the sour ones less so. If you were to go to the markets in the days leading up to December 31st, you can buy little packages of 12 grapes, already peeled for quicker consumption.
When we were living in Spain I inquired about the origins of this tradition and was rather amused to learn that it all began as a marketing scheme. You see, one year (about a century ago) there was a bumper crop of grapes in the southern provence of Alicante. The farmers needed a way to sell the grapes before they all spoiled so they came up with this "tradition". One hundred years later I'd consider it a true tradition. And a fun one at that.
All of our grapes were sweet. I am hoping that your 2013 is full of sweet grape months too!