On Saturday, October 12, I have only one thing scheduled on my calendar: “Empty Day.”  There are no ambassadors for this event, no Bob Geldof types leading a musical tribute. There’s no hashtag, and a look at the website is like taking a refreshing trip back to the World Wide Web of 1996.  Damian Bradfield, the British tech entrepreneur and president of WeTransfer, appears to be involved in this low-key effort. And he took a