Being a delegate isn't a matter of how many events you attend. Go to competitions, HELP OUT (don't just sit with everyone else and cube), get to know the organizers, get some experience of what it takes to run a competition.
Yup, the first competition I was at was the US Open 2007. The second competition I was at was the Minnesota Open, where I was the delegate. I had been active on the WCA forum for a while discussing rules. I e-mailed Tyson when I found out the US Open would be in Chicago, and told him that I wanted to be able to help out so I could gain experience of running a competition so I could hold one in Minnesota.
In explaining my case for being a delegate, I mentioned how I have done judging for Odyssey of the Mind (now Destination Imagination) for a few years. Basically, this was to show that I can read unique regulations and follow them. I also let him know that I've done election judging for elections. In elections, you have to be tough. When people complain about why they think they should be able to vote without the proper identification, you don't let any rules slide and you stay your ground. Also, I think my discussion from the WCA forum probably also helped show I was familiar with the WCA regulations.
If anyone is interested in learning more about organizing a competition, then talk to the organizer of one your attending and ask if they'll let you shadow them so you can learn how to run a competition. If someone going to Wisconsin is interested in that, then let me know.
Of course, the choice of delegates is up to the WCA. There's no guarantee that if you do this, you'll become a delegate too, but I'm guessing it can't hurt.