Hockenheimring is a race track in the south of Germany where the Formula One German Grand Prix has regularly taken place since 1977. Here are links to all the sites you need to experience the circuit yourself
Hockenheimring official site – the site is available in English and provides a huge amount of information about upcoming events and experiences at the track.
Pistenclub – Offer track days at the circuit as well as Spa, Monza, Nurburgring and other.
European Speed Club – Offer driver training course and trackdays with training bias at various european circuits. This is a German website that Google translates easily into English.
Deutscher Sportfahrer Kreis – German race drivers club that offers members trackdays and discounted tickets to motorsport events. Site is provided in German only but Google can translate it.