Jewish communities around the world depend on their local Hatzolah organizations all year round. But the stakes are even higher during the summer, especially in Upstate New York, where the population quadruples. Catskills Hatzolah, established 32 years ago, is arguably the busiest and most active Hatzolah in the world during the summer season — and for its five dedicated coordinators, the summer is not much of a vacation.