A group of friends standing by their car

A photo of a group of friends standing by their car on a beach. The car with the open sunroof has the registration mark M-MX-62 which tells me it’s a car registered in Germany, more specifically in Berlin. That style of registration plate was introduced in 1956, so this photo was taken after that date.

The friends are raising glasses to the other member of their party who is taking the photo and since there is also another car in the picture perhaps they were in that car?