Frederick Law Olmsted’s 200th anniversary will be celebrated in Essex County Anderson Park in Montclair with live music, a vintage bicycle display, children’s activities, a puppet show, and a theatrical living-history portrayal of Olmsted. Anderson Park is an Olmsted-designed landscape on the National Register of Historic Places. FREE. From 1-4 p.m. A schedule of activities, and accessibility information, will be at www.FriendsOfAndersonPark.com. The park is at 274 Bellevue Avenue, Montclair. Check the Friends of Anderson Park Facebook page for any rain date rescheduling. (Rain date is May 15, same time.) Sponsored by Friends of Anderson Park and Essex County Division of Cultural and Historic Affairs.