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The source supplied the following definitions:
"For the purposes of this study, an exhibition, show, or fair is an event in which products, services, or information are displayed and disseminated. Exhibitions differ from “conference”, “conventions” or “seminars”, or other business and consumer events. Exhibitions exclude flea markets and street markets."
"Exhibitions direct spending represents spending directly incurred in the planning and production of exhibitions, travel to exhibitions, and accompanying exhibitions-related activities. As a basic description this includes spending by participants to attend the exhibition (e.g. travel and registration), organiser-paid travel, spending by exhibitors (e.g. sponsorships, exhibit production, off-site events), spending by exhibition organisers and hosts, and certain other exhibitions-related spending. "