What is the term for a formal event showcasing materials and services from various industries?

The term that best describes a formal event showcasing materials and services from various industries is "Trade Show." A trade show is specifically organized for businesses within a particular industry to display their latest products and services, network with other professionals, and explore new trends and technologies. These events are often attended by industry professionals, buyers, and sellers looking to foster connections and gain insights into the market.

While other terms such as expo and open house may imply a similar gathering, a trade show carries the distinct connotation of being a large-scale, industry-focused exhibition designed to facilitate commerce and collaboration among industry participants and stakeholders. SkillsUSA Championships, while significant for skills competitions, do not encompass the broader purpose of showcasing industry materials and services as a trade show does.