I just heard that the Family Circle tournament has moved from HH. Not sure if it's this year or next...
We've been there a few times during MCI week. Happy hour seems to be the most crowded time at the bars/restaurants. Compared to ten years ago, traffic is getting rough on 278. Combine tourists who don't know where they are going, and elderly people who should no longer be driving and things get a bit crazy. Also, the traffic circles make no sense at all. They have improved a few but there are still fender benders all over the place. Considering that, we've never experienced any gridlock, it seems to move along pretty well. Just drive defensively and you'll be okay.
Once you're off the main road and at your resort you'll forget all about the traffic. I like to park the car on day one and bike the whole week!