The phrase denotes organized social gatherings occurring in the St. Louis metropolitan area during the Halloween season. These events typically involve costumes, themed decorations, entertainment, and refreshments. An example would be a costume ball held at a downtown hotel during the month of October.
Such festive occasions provide opportunities for community engagement, boosting local businesses through event spending and tourism. Historically, Halloween celebrations have evolved from ancient harvest festivals and religious observances into secularized forms of entertainment and social interaction. These localized events contribute to the cultural vibrancy of the region.