 Complete the following phrase:  The event was a unique footnote in the history of the Indianapolis Motor Speedway. Between 1911 and 1993, the Harvest Auto Racing Classic was the only time an official race other than the Indianapolis 500 was contested at the track. It as also the last event held at the facility prior to the United States involvement in World War I. The track would shut down for two years 19171918 during the war, and reopened in 