And the very first image on that page is a FTC (FIRST Tech Challenge) field - one of the parts of the tent I co-organized over the weekend. And shlepped around. And protected from the rain. (See pics of that on my blog)
Yes, we have one in Detroit. We were supposed to go this year, for the first time, and it happened to be the weekend of my older son's birthday, so it was going to be a fun family outing. But he broke his arm the weekend before and was still feeling mopey, so we decided to hold off until next year. It's definitely on our radar.