its essentially just a chance for people who have nicely/heavily modified cars to really stretch their legs in a fixed test that is common to all. Its a great day, lots of banter if you want it, or you can just get on with it...its up to you.
for me personally it is the one event of the year that i will be hopefully able to max my car out.
If you wanted to come along as a spectator you still have to give your security details over to the MLR and jump in wth someone thats signed up i believe.