The property and its spaces
Walnut Grove was built in 1765 and is on the National Register of Historic Places. Rentals take place in the Pavilion, which has a kitchen and a fireplace and seventeen wooden picnic tables with benches that the renter may move and must return to their default places.
The rental rules say the interior of the historic buildings cannot be used for the event, except for guided tours that are arranged ahead. All food and drink service is limited to the Pavilion.
Sound and hosting at Walnut Grove
The venue's rules set a 10:30 PM music cutoff and a county ordinance that nothing be audible from adjacent properties. That means I tune the sound to the Pavilion and favor clarity over volume: speakers aimed into the crowd and bass kept under control so it does not carry past the property line.
The venue offers a Bluetooth-capable sound system for a fee. For a ceremony or a small gathering that may be enough, and for a full DJ night I bring my own gear and send the venue a plan. I plan your timeline so toasts, first dances and your last big dance finish before 10:30.
Lighting, power and effects
Nothing can be attached to the historic buildings, gates or trees with wire, tape, tacks, nails, zip ties or adhesive, though string, twine, fishing line or ribbon are allowed. So I light the Pavilion with freestanding fixtures on stands and keep the old buildings untouched.
The rules prohibit fireworks, sparklers and any fire or spark producing products, so I would not plan a cold spark exit here unless the venue approves it in writing. Fog is not mentioned in the published rules, so I ask. I send a power plan listing circuits, and ask where the Pavilion's power is, since low fog needs a dedicated 30 amp circuit.

Planning notes for couples
Tents, tables, seating and accessories beyond the site's picnic tables must come from you. Deliveries and pickups must happen within your rental hours, and the venue asks for the times three days ahead.
The site is open to the public on set days, so ask how that works with a wedding day rental. Start by sending the venue's rental request form.