Jeff, it is from the 21-23 of July in Murg.
Murg is between Zurich and Chur in Switzerland. Strandwiese- this is the sort of "Beach" or grassy area next to the lake.
Strandwiese drinks are probably beer, cocktails and wine. BBQ I am sure is the same
I lived in Germany and Switzerland for over 17 years. If you need any help with translations in German or if you need to book a trip, just hit me up.