There are certainly opportunities for après-ski in the huts on the Hochkar, for example at the Latschen-Alm at the Almlift or the après-ski bar Joschi at the lower parking lot. Since most of the huts are located near the valley stations anyway, you can have a drink here without a guilty conscience, because you don't have to tackle long descents on your skis afterwards.
Unfortunately, the atmosphere in the restaurants and huts does not last too long after the lift closes. In the valley in Göstling, the skier will not find an opportunity to party the night away.