Get a subscirption - online and free - to the NRA publication "Shooting Sports". At the rear, every month, is a list of every registered match in every shooting discipline in the country.
Roslyn Rifle and Pistol in Westbury holds the regional Championships for indoor .22 in late Winter, early Spring.
There used to be a 2700 held every month at the Peconic River Sportsmans Club....not sure that they do that anymore.
"Only hunting and mountain climbing are sports. The rest are just games." - R.Ruark
NRA Life Member