Grab tickets and join the crowds at a game at Henan Stadium. If there's nothing scheduled while you're in the area, you might like to check if the stadium offers a tour of the facilities.
When you've spent a bit of time at this sporting facility in Jinshui District, why not check out Henan Museum, Zhengzhou Museum, and Erqi Memorial Tower? They're not too far from Henan Stadium and also a favorite with many tourists.