Get your Guts in Gear -- just cracks me up. I know, it's a serious disease, but what a funny (and almost disgusting) name.

If you can't find a fundraising ride, you could always do something on your own. Or, you could participate in a different organized ride, but have a fundraising campaign that benefits the Chron's Foundation and run it through one of the various fundraising sites. I know other athletes who've done that.

Good luck to you and my thoughts go out to your father as well!