André Wieners (Swatch Collector from Germany) sent me the following photos taken in 1995 and a few notes:
On 12-AUG-1995, the C-Monsta Beach Party took place on the beach of Otto-Maigler-See in Hürth near Cologne. A tent was set up in the lido where the Swatch Scuba 200 Summer Special C-Monsta (SDZ101) could be purchased. The watch's warranty certificate was provided with a special sticker from the event. There was also a big music stage. I don't remember which groups played there.
According to the German Swatch News (SEP/OCT-1995), 150 people worked at the event for "thousands of Swatch collectors" (those were the days).
In the United Kingdom, a Monster-Party was held in Brighton on 29-JUL-1995. 1500 Swatch collectors participated at the Shark Attack Party.