Registration (free): 10 a.m.–10:30 a.m. and on a first-come, first-serve basis in-person at the beach Bathhouse on the day of the event. Castle building: 11 a.m.-3:30 p.m.; judging: 3:30-4 p.m.; limited to 10 teams; rain date: Sunday, August 8. Participation is free; admission and parking rules apply. Westchester County residency is required. Weather permitting.