City of Andover issued the following announcement on May 13.
The City of Andover is continuing to re-evaluate and make adjustments to our COVID-19 response plans. Today the new advisory signs are being posted. In addition to playgrounds, trails and preserves remain open as they always have been. Courts and fields are also open for small groups of under 10 people. Please remember to practice social distancing and enjoy the parks safely
Original source can be found here.
Source: City of Andover