Automatic cocktail machines and robot bartenders. The case for them is not speed but repeatability: the tenth Negroni of the night is measured the same as the first, which is the part a tired bartender stops doing around midnight.
Machines that mix and pour drinks with little staff input — automatic cocktail machines and robot bartenders. Self-pour beer walls live under beer dispensing: they pour a kegged drink, they do not mix one.
It speeds consistent drinks and covers volume or staffing gaps; many venues run it alongside staff for signatures.
High-volume events lean to the machines; a robot bartender is also a draw in its own right. Tell us the setting and we'll advise.