You may have experienced the crush of people at yesterday's Red Sox rally (I didn't go.) We experience it once a year. 100,000 people are expected tonight, with a heavy police presence to go along with them. That's the NEMLEC mobile command post in the photo.
I have a police scanner and I've been streaming it over the web for a few years. Unfortunately, my server I use to stream is broken, so after going to plans B, C and D, I set up a Shoutcast streamer on my desktop machine. It's at http://n1kgh.gotdns.org:8000/ and is openable in Windows Media and Winamp.
I was supposed to make an obligatory "Is celebrating Halloween in the true 'character' of the city?" but the Boston Globe already beat me to it; After we get through tonight, I'll say something.