It started in the Bronx, in New York, with neighborhood block parties during the 1970s. It soon became a global phenomenon. The convergence of creativity and community are what helped birth hip-hop, both as a culture and as an influential music genre. In a fitting tribute to its origins, DJ Grandmaster Flash, a hip-hop forefather, will be spinning tracks at a lively bash Wednesday at Kennedy Plaza. The Wichita Riverfest’s Wet ’n’ Wild Neon Dance Party promises to be a high-energy event.