If you can, come in a Stabber-based hull (and a cheap clone).
General good-natured chaos will be the order of the day, with various attempts at co-ordinating conga lines, memorial shoots and suicide protests before rendezvousing with the passing RvB Ganked fleet. The RvB Fleet will then lead the charge out into null where those with an issue with the Vagabond manufacturers Thukker Mix can formally lodge their protest. After that, survivors are welcome to continue on with the RvB Ganked fleet, whereever they may be heading after.
Ostensibly because of the "circumcision" of the Vagabond. The removal of the "frills" has send folk like Rixx Javix, Swearte Widfarend and others into an apoplectic rage, causing them to generate forum threads, blogposts and even videos. If you feel as they do, then this event is definitely for you.
Personally, I just love the passion of the EVE community and see this event is a positive way of celebrating that, showing that the players have a voice and that we can make a point with some humour. Last year there were serious issues inflaming player passion, this time it's just a matter of taste. Whether you think the Vagabond frill is important or not isn't the driving reason you should join us - it's because sometimes internet spaceships doesn't have to be serious business.