From Longman Business Dictionary
exhibitionex·hi·bi·tion /ˌeksəˈbɪʃən/ noun [countableC] especially British EnglishBrEMARKETING a public event where businesses and other organizations show their products and services so that people can go and see themExhibitions and trade shows are expensive but good ways to promote a message or an image.
the Expo 99 exhibition
→ trade exhibition