Product designer/engineer in the US
If the team is going out to lunch to celebrate a special occasion, then a single drink has always been fine in the teams I worked with. I don't partake anymore because it makes me really sleepy in the afternoon.
I worked at one company that hosted a weekly happy hour. I was one of the employees who took turns setting up the kegs in the common room, and pouring drinks during the event. That was a fun place. The extra social time really improved some working relationships. And we got a surprising amount of productive work done just by talking for an hour or two while standing around sipping microbrews and wine.