How did Happenings help announce the arrival of Pop art in the United States?

In the United States, the arrival of Pop art was heralded by a combination of artistic developments, most notably the assemblages of Robert Rauschenberg and Jasper Johns, alongside a brief but significant vogue for Happenings.1

Happenings were elaborately staged, environmental events devised by artists such as Allan Kaprow that aimed to bombard audiences with sensory stimulation. By taking the artistic gesture beyond the confines of the canvas and into public space, these events helped set the stage for the emergence of Pop art. While Happenings were briefly adopted by several Pop artists—including Claes Oldenburg, who produced notable works like The Store (1961)—they were fundamentally driven by a desire to operate in the gap between art and life.123

Ultimately, these events served as a precursor to the Pop art movement, which would soon define itself through its objective, often ironic engagement with the commodity-driven values and mass-media imagery of the postwar era.1