drinking occasion; situation with alcohol; over a drink
Refers to a social setting where alcohol is served, such as a party, dinner, or bar gathering. Often used when describing behavior, conversations, or events that happen in such a context.
A slip of the tongue at a drinking party can sometimes be unforgivable.
Since it's a drinking occasion, please don't be too formal.
Compound of 酒 (sake, 'alcohol') + の (possessive particle) + 席 (seki, 'seat' or 'occasion'), literally 'a seat/occasion of alcohol'. The expression is straightforward and modern.