The Boston Blog: Boston's Freedom Rally—ParkerPettus.com Did anyone go to this? I went back in 1996 or 1997, and I remember there being an effort by the police to send undercover officers into the veritable cloud to arrest people for marijuana, particularly those who were selling it. If you've been to the Hempfest, you know why this doesn't make sense. During the event, there are thousands of people occupying the better part of the Boston Common, the vast majority of whom are openly smoking weed and/or acting very high. The cops could just walk right in and arrest pretty much everyone, with absolutely no need to be undercover. And you could say they don't do it because it could cause a riot, but I don't think so. I mean, really, are a few thousand stoners going to take on the Boston PD? Well, they might, but I have my doubts.