hehehe 21ste of december you mean ? I dont see anything happening, not hiphop related hiphop anyway. Melkweg ( name of the club ) has a concert with Dutch MC's on the 25th. Haarlem ( the city Harlem was named after ) has CL Smooth at the Partonaat, but that's on the 18th. On the 17th the Roots will be in A'dam performing at Paradiso.
nothing going on on the 21.. why are you coming on a tuesday hehehe.
you should check out cafe the duivel, they always have hiphop..
Regulierdwarsstraat that is the street that it is in so if you wanna check it out ask around or look on a map hehehe.