The Parking Problem
Rural venues have a field for cars, and the field is fine until it rains or until a hundred people all try to leave at once.
Count Cars, Not Guests
A hundred guests is roughly fifty to sixty cars once you allow for couples, and more than that in an area with no taxis. Venues quoting parking capacity in guest numbers are quoting the wrong number.
Then add suppliers. A marquee crew, a caterer, a band and a photographer will bring six or seven vehicles that all need to be near the building rather than in the far field.
Wet Ground Is the Failure Mode
A grass car park that has taken rain will bog, and the recovery cost is not just a tractor. It is fifty guests standing about at midnight while cars are pulled out one at a time. Trackway on the entrance and the main run is dull money extremely well spent.
Ask the venue what they do when it is wet and whether they have ever had to tow. The ones who have will tell you straight; the ones who say it has never happened have not been open long.
Getting People Home
Rural taxis do not exist at midnight in the numbers you need. Book a coach or a minibus shuttle to the nearest town, publish the times on the invitation, and repeat them on the day.
Leaving cars overnight has to be explicitly allowed and explicitly communicated, along with when they have to be collected. Otherwise you will spend Sunday morning fielding calls.
