Basically, the idea is that a wide group of people spontaneously show up at a single spot. They hang around for 10 minutes or so, then scatter again. The whole thing is organised by email or sms. Like all the best things in life, there’s no profound point to it, it’s just for fun.
Read more at Cheese Bikini. I heard about it on Joi’s site.
I suppose if there is a profound point to it (and I’m not saying there is) I suppose it might be that mobile communications and the Internet can be used to bring people together very quickly around a particular issue (or rug).