MPP is excited to be cosponsoring the 2011 Seattle Hempfest on Friday, August 19, through Sunday, August 21, and we're looking for volunteers to help us out! We need people to help us staff our table, as well as people to sign Hempfest attendees up for our free e-mail alerts.  Everyone who volunteers will receive a free MPP t-shirt and get to meet lots of great supporters, all while enjoying the world's largest marijuana-policy-related event. As an added bonus, the person who collects the most email…