The 49th Annual SuperClean Knoxville Nationals mean thousands of race fans converging upon Marion County, and that means good news for those with space to rent – not just in Knoxville, but in the surrounding communities. Pella Chamber of Commerce Executive Director Karen Eischen tells KNIA/KRLS News that all or most of the nearly 400 hotel rooms in Pella are booked through the races, and some residents will also have guests stay in their homes as well.