FWIW, Juana's has been the weekend after Labor day since its inception in 1985ish.
I think Catfest was started at a similar time, the weekend after Labor Day. Maybe Mark or someone else knows the exact year as I recall him wearing a Catfest shirt from the early-mid 90s. I always thought the history of the LNYC multihull fleet was cool, with the majority of the fleet being composed of 18 squares.