Here’s a fun promotion for the launch of Windows Phone 7 in the U.S. starting November 8th. Visit select AT&T stores on November 8 to get FREE tickets* to either a Katy Perry concert in New York City or a Maroon 5 concert in San Francisco that night. Admission is first-come, first-served. For a list of participating locations, check out this link. I wonder if these artists will also promote Windows Phone 7 at their shows. Also, how will this affect the lines for people who are trying to buy Windows Phone 7 devices?