Can people walk from ceremony venue to reception venue?
How will most people get to the ceremony? Drive or public transport with expectation of a taxi home? Do you need the timings to be tight?
Due to my friendship group I've mostly done weddings where people have needed to stay over. In which case, especially if distances were significant a bus between ceremony and reception was pretty essential.
I'm aware of one rural wedding in a very flashy/ expensive venue with no onsite or local accomodation. Therefore most of the guests stayed in the nearest (20 miles away) large town as it had a clump of affordable hotels (think travelodge/ premier inn type prices) most of which were co-located.
The guests were mostly based hundreds of miles away so had flown up and incurred expenses ++ to attend in the first place and then found themselves having to fork out for taxis to travel the 20 miles to and from the rural venue from the town or hire a car and then decide who would drive and thus sacrifice drinking.
It only became apparent quite late on in the game there would be no transport from the suggested accomodation to the venue.
It didn't go down very well. Especially when the well paid half of the couple justified it by saying they had to economise somewhere.
I'm going to a wedding later in the year in London. We will mostly all get to the ceremony by public transport (or taxi). But I know there is going to be a bus between that and the reception venue as they want us all to arrive there are roughly the same time. There is also very little parking in either location.
I'll probably get the tube home too! Assuming the people who are coming to stay with me for the event don't make a fuss about that!