In the page's words:

The annual ROCKTREFF in the Volksparkstadion Mariendorf is an open-air festival dedicated entirely to handmade music. Here the guitars are unpacked, the amplifiers are turned up and the hair is shaken together. The aim of the Rocktreff is to offer amateur bands a suitable stage to present themselves to the largest possible audience and, on the other hand, to offer the general public a free event. The ROCKTREFF is one of the largest purely amateur band festivals in Germany.

Every year, 16 bands are selected from hundreds of applications to make up the line-up for three days of the festival.