I think Americans just aren't used to saying we're out to socialize. It's what's happening, but we're bad at it and we're not used to being explicit about it.
As a member of this target demographic, I would say that catering to American drinkers would be to provide a pretext to be at your establishment. You don't have to actually provide all that much, but if you provide a reason for being there that isn't, "Socialize with others" I bet you'd attract more Americans. In America we do "brewery tours" for example, but it doesn't even have to be related to alcohol itself ("good" music, board games, axe throwing, bumper cars, pub quiz, karaoke, etc.). What matters is that you're plausibly not there to "socialize", even though that's actually why you're there.
As a member of this target demographic, I would say that catering to American drinkers would be to provide a pretext to be at your establishment. You don't have to actually provide all that much, but if you provide a reason for being there that isn't, "Socialize with others" I bet you'd attract more Americans. In America we do "brewery tours" for example, but it doesn't even have to be related to alcohol itself ("good" music, board games, axe throwing, bumper cars, pub quiz, karaoke, etc.). What matters is that you're plausibly not there to "socialize", even though that's actually why you're there.