For almost two decades, Memorial Day Weekend has meant Urban Beach Week on South Beach, featuring hip-hop music, parties and high fashion. But in recent years, city officials have been criticized for their treatment of visitors during the weekend, most of whom are black. Critics say visitors are scrutinized more than those who attend other events, like Art Basel. In a letter to city officials last year, Miami-Dade NAACP branch president Ruban Roberts wrote that Miami-Dade's African-American