The city also got more sex appeal. Many girls on the streets or in the restaurants & bars are very summerly dressed - one of the joys of a hot summer day.
According to Wikipedia many cultures traditionally celebrate the summer solstice event in some way with holidays, festivals, and rituals around that time with themes of religion or fertility (wikipedia). Tomorrow Coney Island will have its traditional "Mermaid Parade" where the girls show a lot of skin (coneyisland.com). If you are more in raucous rock music you could visit "Punk Island" which is celebrated on Staten Island also tomorrow (punkislandnyc.org).