This phrase refers to a Halloween-themed convention or gathering held within Contra Costa County. It suggests a planned event, likely featuring vendors, activities, and attendees centered around the Halloween holiday and associated themes like costumes, horror, fantasy, and related pop culture elements. As an example, one might describe attending this type of event to find unique decorations or meet other enthusiasts.
The significance of such an event lies in its potential to foster community engagement, provide entertainment, and support local businesses. These gatherings offer a space for individuals to express their creativity through costumes and artistic endeavors. They can also create economic opportunities for vendors and contribute to the cultural vibrancy of the region. The historical context for such events draws upon long-standing traditions of Halloween celebrations, adapted and expanded to incorporate convention-style formats.