Check out these upcoming NYC pub crawls:
Saturday, May 5 in Manhattan, organized by pubcrawls.com: http://pubcrawls.com/events/cinco-de-mayo/cinco-de-mayo-pub-crawl-nyc.php
Saturday, May 5 in Manhattan, organized by barcrawls.com: http://barcrawls.com/newyork#/Cinco-de-Drinko-Bar-Crawl