One of the things I've noticed in my more recent sobriety (a little over two years) is that what appears to be a drunk fest isn't always that. I've observed that often on a holiday weekend I'll see people loading up car boots with boxes of beer or wine, taking them home or to places and then not necessarily consuming very much at all.
Because I'm sober at the end of gatherings I'm noticing that very often eskies and fridges are still relatively full -- probably because my own snout isn't in the trough these days.
Be careful of imagining that everyone is out there drinking until the bar is dry, have a look at what everyone is actually doing, many of them are not only sober after a drink or two, many don't even start. And don't forget that a huge percentage of the population aren't even going to drunk fests, they are the people out enjoying themselves.