Double-round weekend in Fontana on the docket for California Prokart Challenge Double-round weekend in Fontana on the docket for California Prokart Challenge Two-race weekend format set for June 24-26 at the CalSpeed Karting Center facility Bas Kaligis / Saturday, June 18, 2022 0 937 Article rating: No rating In just one week, the California ProKart Challenge returns to action and hosts the lone double-round weekend of the season. Competitors from all over the west coast will converge on the CalSpeed Karting Center facility in Fontana, California during the June 24-26 weekend for Rounds Three and Four of the Superkarts! USA regional program. Read more