Hi. I am trying to work out why the pronoun "EN" is found in this sentence. Is it there to replace the implied "DE la soirée" as in "On était déjà à notre troisième cocktail de la soirée" ? Or am I way off track ? Thanks for shedding any light here.
(And another thought, could it have equally been "On y était déjà à notre troisième cocktail" with the pronoun "y" used instead of "en" - in this case to replace the implied "dans ce bar" ?)