I checked out the Yerba Buena Center website their Calendar does not say any event scheduled on 7th March by Apple ??
Apple's invitations went out only moments after financial network CNBC incorrectly claimed that the next iPad would be unveiled at an event in New York next week. However, reporter Jon Fortt quickly followed up to explain that he has heard that New York will play a "key" role in next week's announcement.
The March 7 event date has been expected for weeks now, but Tuesday's invitations were the first official confirmation of the media briefing from Apple. Recent reports out of the Far East have suggested that Apple could offer near-immediate availability of the new iPad, with claims that the new devices are already being shipped to the U.S.