thank you, a book says "a goodwill gatheirng", but I was suspicious.No, I don't think there's one specific name for this. It might be called various things but I think it would always have to be explained exactly what it was, e.g:
Purchasing department evening/drinks: an opportunity to share ideas with your colleagues over drinks and snacks.
If it became an established thing in a company, the name could be shortened to e.g: Purchasing department drinks because everyone would know its.
Thank youIt sounds like a Happy Hour. (In medical training we used to call this Metabolic Rounds.) You might want to reconsider your use of the term whereabouts. It doesn't mean "what's going on with me" as you seem to imply from your use of the word. It actually refers to location.