A full week of activities is planned, culminating in the 78th version of the races on Saturday, July 25.
Opening ceremonies are set to begin Monday.
Boy and girls as young as 7 will be driving the gravity-powered cars. The kids come from all over the U.S. as well as Canada, New Zealand, Germany and Japan.
Racers were able to qualify for the derby by winning just one race in their local community or by being a rally champion after competing throughout the year.
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Source: Win McNamee / Getty