In early October 1959, thirty-two-year-old Allan Kaprow presented a performance piece entitled "18 Happenings in 6 Parts." This unique conjunction of visual, aural, and physical events, performed for an intimate art world audience by his friends and colleagues, would change the course of art history. The genre of artwork that evolved from this debut would become known as Happenings. Author Mildred L. Glimcher, an art historian, author, and close observer of contemporary art for more than fifty years, provides a vivid and comprehensive look not only at the genre, but also at the culture and society that surrounded it.