You just sign up for them, it's not really complicated. Then there's a bunch of matches and eliminations and you've just gotta last through the end. I haven't done one yet but I've been thinking about it. See? There it is.

[He lives close by, since the Coliseum's the heart of the world really - Ven points to the large gates open up at the end of the street, a large building visible through them.]