How Two Twenty-Somethings Built A Music Festival in Miami

Miami rap festival Rolling Loud will draw 60,000 fans daily to see artists like J. Cole, Migos and Post Malone

One of hip-hop’s biggest festivals comes from two millennials in Florida.

Rolling Loud, a three-day concert starting May 11 at the stadium where the Miami Dolphins play home games, will be headlined by J. Cole, Travis Scott and Future, with Migos, Post Malone and more than 100 other rappers and groups also performing.

The annual event,...