Found on another site:
Tisha B’av next year is on a Tuesday. The NYC Tri is the Sunday prior. Again.
I checked the dates for previous triathlons, and to my surprise and dismay, in four of the past five years, the NYC Tri always fell out the Sunday before Tisha B’av. The English dates were in a broad range; but on the Hebrew Calendar the dates were eerily consistent. What could account for that? Even I, a red-white-and-blue blooded American Jew, was beginning to wonder: Was it actually possible that the organizers of this event were discouraging Orthodox Jews from participating? What else could it possibly be?
So I emailed one of the organizers of the event. Why were the dates of the Tri so varied?, I asked. Her answer surprised me. The currents, she wrote back, have to be favorable between 6 and 9 in the morning. And you know this so far in advance? I asked. Years in advance, she responded.
I breathed a sigh of relief.
Eisav Sonei LYaakov.
Never turn your back to them.
I don’t chap. What is the NYC Tri (triathlons)?
A triathlon is a multi-sport endurance event consisting of swimming, cycling, and running in immediate succession over various distances.