Which is not easy to translate but, given the context, roughly means something like "Make merry together". The road signs have gone up again for the annual fest on Hinterdorfstraße next weekend. Frankly, it looks like an invitation to get hammered on cheap fizz.
Be that as it may, it's worth spending an evening there with friends. We (myself and two friends from Weil - Adrian and Sumudhu) normally go and sit outside the bar run by the people from Weil's twin town Trebbin, as the service is friendly and it's a bit more quiet. However, my friends became parents a couple of months ago and probably won't be that keen this time round. If I knew more people in Weil, this wouldn't be a problem.