"Hosted by the Old City Arts Association since its 1991 inception, First Friday is a unique cultural event in Philadelphia and one of the city's most popular evening escapes. Held the first Friday night of each month, this arts community "open house" brings together city dwellers and suburbanites, contemporary arts and antique collectors, aficionados of classical and contemporary design, and theater and performance buffs."
(http://www.yelp.com/events/philadelphia-first-friday)