NYG Rock River Chase Concession Stand, June 23-24. Come on over to Seward’s Park in Rock Falls for the Rock River Chase June 23-24 from 10:30 a.m. – 5:00 p.m. This stock outboard boat racing event on the Rock River is free and family friendly! The NYG team will have a food stand along the water front. You are most welcome to come and support the team and take in a few races!