If you were in New York last weekend, you may have seen the 20,000 runners taking part in the United Airlines 2016 NYC Half-Marathon. The 13.1 mile course snaked its way through Central Park, down the West Side Highway, and finished off on Wall Street. The epic New York City Marathon not withstanding, the next big running event will take place in Brooklyn, where the Airbnb Brooklyn Half-Marathon will unfold on May 21st.