Downtown Central Park (Bus. 83 & Main Street) Alamo. (956) 750-2322. Lets get ready for our 10th Annual Watermelon Festival & Cook-off!! Festival kicks off with the the State Sanctioned Cook-off early Saturday morning leading to our musical line up starting at 3pm! There will be plenty of family fun, carnival rides, food vendors, arts & craft vendors, beer garden and live music!!