open farm event; open farm day
A public event where a farm opens its grounds to visitors, often for tours, hands-on activities, or direct sales.
from English open farm
Next week, you can try vegetable harvesting at the local open farm event.
On open farm day, you can tour areas of the ranch that are normally off-limits.
Borrowed from English 'open farm', referring to an event where a farm is open to the public.