Is it simply a 'pay bar'? I've checked with the hotel and they do accept cards - people can start their own tab - as well as cash.
Just working on a thankyou letter for those that have responded to say they're coming, and can't quite get the terminology right.
We are providing non alcoholic drink options throughout the day, but if our guests want alcohol they will need to pay for their own.
The discussion of whether this is normal or not has been done several times, and I realise that our choices may not suit everyone, but that is what we want to do. Assistance with wording ratefully received.