Hip Hop festivals and congresses

Hip-hop dance refers to social or choreographed dance styles primarily danced to hip-hop music or that have evolved as part of hip-hop culture. This includes a wide range of styles notably breaking, locking, and popping which were developed in the 1970s by Black Americans. What separates hip-hop dance from other forms of dance is that it is often freestyle (improvizational) in nature and hip-hop dancers frequently engage in battles—formal or informal freestyle dance competitions. Informal freestyle sessions and battles are usually performed in a cipher, a circular dance space that forms naturally once the dancing begins. These three elements—freestyling, battles, and ciphers—are key components of hip-hop dance.

Source:
http://en.wikipedia.org/wiki/Hip_hop_dance