Mellow Mark and Crosby have done a collaboration back in 2015 for his album 'Roots and Flugel' and have shared stage at Reggae Jam Festival, Bersenbruck the same year. The performance at Africa Festival Wurzburg will take place on the 27th May 2017. 
Wurzburg was the first international tour that Crosby was part of with African Dope Soundsystem back in May 2005. This will mark more than ten years of re-appearing at the one of Europe's biggest festivals.