The City of Concord has several park areas available for event rental. This park (in my opinion) is the best.
The grove is a little lower than the street so you atr protected from noise. The city does a great job maintaining the park.
You need to make sure that you have somebody at the site early on the day of the event. If you have it rented you will be able to use it, but it may take time to get someone removed after they set-up. The city will assist and remove interlopers, but its better to not let them squat in the first place.
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