Posketv, also known as the busk or Green Corn Ceremony, is a ritual cycle comprised of sung dances, including opvnkv haco (stomp dances), hvsē opvnkv (ribbon dance), and other ceremonial and social dances.

The concept of ometv, meaning to emulate or become, is central to the performance of the busk. Through enacting the ritualized behavior of non-human beings, performers become, as far as the surrounding ecology is concerned, a combination of themselves and their subject.

Descended from the ceremonies of the expansive Mississippian cultural complex, many communities across the southeast, including the Cherokee, Chickasaw, and Natchez, practice the busk under different names. Opvnkv haco is the name for the performance tradition in the Muscogee language.

The Muscogee-speaking Seminole (pictured) perform an annual Green Corn Ceremony containing syncretized Christian elements. The Muscogee Creek Tvlwv Pvlvcekolv community maintain a tradition among the best preserved in the southeast; having evaded relocation during the Trail of Tears, they continue to perform the busk on their pre-colonial ceremonial grounds in northern Florida.