With the Mississippi Valley Blues Society presenting the concert in partnership with the 2024 Xtream Rock Island Grand Prix, a pair of thrilling, Chicago-based blues acts take the outdoor stage of Rock Island’s Schwiebert Park in the final presentations of the MVBS’s summer season: an afternoon set with the high-energy talents of the Sean McKee Band, and an evening set with the equally gifted artists of the Kilborn Alley Blues Band.