Munroe Falls Metro Park, 521 S. River Road, will offer free lake swimming from 3 to 6:45 p.m. Tuesday and a one-hour concert featuring patriotic selections by the Metro Parks Ensemble at 7 p.m. The concert, which will be held near the Maple Beach Shelter, will be canceled if it rains. Call 330-865-8060 if wet weather is in the forecast.