Just got back from a wedding this weekend.
Ceremony was in a village church. Reception was 30 mins drive away in a stately home a good 15 mins drive from the nearest town. No one staying at the venue, pretty much everyone staying in hotels in the nearest town. Don't think any of the guests lived near the venue or knew the local town - venue was picked to be equal travelling for most family and guests.
Pretty much all the guests drive to the church, then drive to the town near the venue, dump the cars and get taxis to the venue so they can have a good time.
Come 11ish, as the party stands winding down, people start casually asking best man and bridesmaids if there's any transport back into the town. There's not. Which is fine, everyone just starts Googling taxi numbers and calling - only to find out there are no taxis available until 3am. Venue closes at midnight...
Best man is going frantic trying to sort it out and not let the bride and groom know. Only one or two staff at the venue actually worked there (rather than being outside catering) and they were pissed off - my impression being they were annoyed/surprised the wedding party/planner hadn't thought about this - another friend's impression was they were annoyed that they'd have to stay until 3 when everyone could leave.
It ended up with the poor few people who did drive to the venue ferrying everyone around at midnight!
AIBU to think that someone at some point in the planning, whether it was someone from the wedding party or someone from the venue, should have mentioned it's in the middle of nowhere, on a Saturday night, and relying on local taxis wouldn't work?
(Also realised afterwards that no one had had an invitation with details on, not a problem really but a invite with hotels and transport etc could have easily highlighted that people should pre-book cabs)
(Oh, and also have nc for this as it would out be immediately!!)