Visit the Lake Elmo Park Reserve, a 2,200-acre parkland, for an afternoon of free summer music. This year marks the 13th annual bluegrass festival, a gathering of local musicians in an idyllic outdoor setting. The musical lineup includes Blue Hazard, Barley Jacks with Brian Wicklund and Monroe Crossing. The festival is free for annual park permit holders and available to all visitors for $5, or the price of a daily permit. 2-6 p.m. South Picnic Shelter, Lake Elmo Park Reserve, 1515 Keats Ave. N., Lake Elmo; 651.430.8370; co.washington.mn.us