The 2023 Carl Sandburg Songbag Concert Series continues Sunday, May 14, with singer, songwriter and guitarist Nathan Cowan performing at the Carl Sandburg State Historic Site in Galesburg. The performance will be in the Sandburg site’s barn at 313 E. Third St. in Galesburg. The show will begin at 2 p.m., with a break for refreshments at 3 p.m. A donation of $5 per person is appreciated to help offset the cost of the performance.