This is a really good idea but it was six years ago and I don't remember seeing it on the forum. Show up to a random location with your boombox and they'll be broadcasting on the FM band so everyone can sync their boxes to the same music. Brilliant, I'm going to have to start planning the first Midwest Get Together that's happened in years... http://geekstar.com/2012/02/03/boom-box-party-in-the-burgh-give-a-dolla/
I saw vídeos of this events and are curious way to have meeting of boombox and cassette lovers, i miss this on Spain