Country music artist Zach Diemer will be performing at the Fountain City Amphitheater from 8-10 p.m. on Saturday during Day in the Park in Bryan. The event planning committee and the Bryan Area Foundation is presenting Diemer, who takes the place of a Girl Named Tom, the Pettisville trio who late Wednesday had to postpone their concert on Saturday due to COVID. The amphitheater events coordinator, is still working with Girl Named Tom for a new date in Bryan.