Gas City Normally cancels early if they are going to get rained out. I think they try to make a decision by 2pm if possible. I have never been to the other place, but Gas city is an awsome track for sprint cars. If the rain holds off you will not only see a good field of car but a competitive field of cars. Plus if you go to gas city, you will get to see Indiana's top 3 sprint car tracks :2:

I more thought, Like the previouse poster said, they normally do good after a rain. Unlike many tracks, Gas City has a very loyal fan base. If they are racing there will be fans. many tracks have to worry about weather or not the rain will scare off the fans. Thus the reason why so many races get cancelled before the rain ever shows up. Actually all 3 tracks you are going to have this going for them.