I'm going to drag the thread back to Brown Wings1's original question. You can expect 10 games split between 2 half days, e.g. 5 Friday morning and 5 Saturday afternoon or vice versa (though you might get 6 & 4). The staging area is likely to be entry by pass only for security reasons, and there will be more trade stands than you've ever seen in one place before.
The atmosphere is usually fantastic, and the majority of the games are hard. If you've never played at an international before, expect to see more paint flying than you thought possible in some games, especially if you watch the Xball. Despite being the biggest tournament in the UK and one of the best in the world, all the players are still as friendly and helpful as they are at most domestic events. There is usually a photographer who develops the photos there and then, so by Sunday you can buy framed piccys of yourself.
Campaign is awsome and amazing if you've only played domestic up until now