Apple has begun on-site preparations for tomorrow’s “Let’s Rock” special event. The event, scheduled to begin at 10:00 a.m. Pacific Time, is being held at the Yerba Buena Center for the Arts in San Francisco. According to Cult of Mac, the building has already been covered on one side by a large silhouette iPod poster matching the image seen on the event invitation, and Apple security guards have been spotted watching over each…
