From Credit Card Watcher:
Beginning May 3, 2013 and continuing through the rest of the year, the Chase Sapphire® Card and Chase Sapphire Preferred® Card will each earn 3x points on dining on the first Friday of each month as part of a new promotion from Chase called First Fridays.
... There is no limit on the number of bonus points you can earn from this offer.
Since I had not received an Email communication of this promotion, I contacted Chase Sapphire Customer Service. A very pleasant associate told me the only notification was through a TV commercial and no written communication was planned.