The Texas Motor Speedway is the scene of the Solar Car Challenge, an event that has been encouraging high school students to experiment with alternative energy since 1993.
According to a post in the QRZ.com forums, special event station K5S will be on 20 meters from the 17h to the 25th of July to celebrate the cars built by students from California, Florida, Washington state, Texas and elsewhere. Listen for radio operators around 14.340 MHz for SSB and 14.074 MHz for FT8. They'll be on the air from 9 a.m. to 5 p.m. US Central Time. The actual four days of the race are the 20th through to the 23rd.
Naturally, everyone is hoping for good terrestrial - and solar - weather. Everyone, start your engines!