I was playing a wedding, last night, and one of the guests was, originally, from Glasgow. I, quickly, had him singing along with "I Belong to Glasgow" and, as a final number, "I'm Noo Awa' Tae Bide Awa'" which he just loved and sang with abandon. (I wound up with a $150 tip from the mother-of-the-bride and a solid rave to the agent).
If the gentleman had been from Ireland, I would have tried "The Parting Glass". I imagine it would have achieved a like affect. I know that there must be lots of songs in that genre. I don't know what the English use for frothy farewells. Americans used to sing "Show Me The Way To Go Home" but they don't do that so much, nowadays. The Univ. of Pennsylvania frats sing a real pretty one called "Drink a Highball at Nightfall".
I am not talking about all drinking songs (although I love them). I mean those songs that good friends sing when they part.