https://community.usms.org/events/f/open-water-events/33157/grand-prix-open-water-challenge-series-start-april-12thThe Grand Prix Open Water Challenge begins on April 12 th and kicks off with the Lake Longhorn Open Water Round-Up in League City, TX close to the Houston Space Center. REGISTRATION IS OPEN NOW . It will be followed on May 3 rd by the Rockport Beachen-USTelligent Community 12