Help pls, Legal responsibilities if someone drives drunk

First off, not an attorney and a lot of this will vary by state. These are good questions to ask your chosen venue. That being said, any venue that has a license to serve alcohol will also have a liability insurance policy to cover claims like what you are describing. There are policies out there that couples can obtain for events like weddings, but if your venue is licensed to serve alcohol, you do not need to spend the extra for coverage for your event there. Now, if you go with a venue that does not serve alcohol - that can create a grey area as some guests will bring their own ( I have seen it happen). In these situations you won't have a bartender to cut off people who have had enough and the venue will likely not have a policy that will pay claims due to consumption of alcohol. Plus you may run into problems with your venue over guests sneaking in alcohol to your event. If you go the route of the venue that does not allow alcohol (which I strongly advise against) I would consider obtaining the event liability insurance just in case.

Our venue is BYO everything except tables chairs & bathrooms. All of our vendors had to provide us with their liability insurance form - as well as we had to take event insurance out through our homeowners. I am not an attorney or authorized to give legal advice - but I was told the bartenders are the ones who are responsible for not over serving. But.....there are ubers avail in our area. Cars can be left at the reception location overnight according to our contract.

Not sure about suing, but that's why it's super important to have a trained bartender that will cut people off so it's not a freeflowing event. We are having an open beer and wine bar, but are paying for a trained bartender to be there to help limit issues like these.

*Disclaimer: Not a lawyer*

The specifics on this may vary from jurisdiction to jurisdiction but generally, the liability lies with the bartender. If you do not have a licensed, trained, insured bartender in your catering crew, you, the hosts, are effectively the bartender in the eyes of the law. This is why people on wedding boards such as WW are so adamant that people do not self-cater and leave their day to the professionals. (Same goes for food. Did Aunt Edna bring crockpot meatballs that were funky in a non-Bruno Mars sort of way? Brace yourself for your guests' hospital bills.)

I'd look into wedding insurance for this!

Not sure about the venues around you, but every single venue we looked at and even the one we booked with required wedding insurance. This covers from the smallest things like something falling off a wall to accidents as such. Look at wedsafe.com, it'll give you some information as to what it covers and it's fairly cheap to cover such an important event.

This is a good question. If you have concerns I would defiantly tell your bartender to cap or cut-off guests at their discretion.