PARIS — It may have been unrecognizable from the blue skies of the promotional photographs. But even the dayslong downpour soaking Paris 2024 could not detract from arguably the Games’ most epic venue, the Eiffel Tower Stadium, which hosted its first beach volleyball events Saturday.

What makes this temporary venue so visually stunning is also the reason it’s so exposed to the elements. Its 11,800 seats are not hindered by any roof or awning, so every seat in the house can see the…