cw: Perhaps so, but congressional delegates and presenters are international (Europe, USA, Britain, Japan etc.).
Not to mention* that exhibiting firms include Merck (market cap US$85 bil), Bristol-Meyers Squibb (m.c. US$43 bil), Johnson & Johnson (m.c. US$180 bil), private Nycomed (sales US$5.4 bil; 12,000 employees), Olympus (m.c. US$9.2 bil), Covidien Tyco (m.c. US$23 bil), private B. Braun Medical (sales US$5.7 bil; 35,000 employees), Coloplast (m.c. US$4.2 bil) et al.
"A billion here and a billion there, and pretty soon you're talking about real money." -late Sen. Everett Dirksen of Illinois
*(edit. It appears the esteemed and vigilant airdale1 already did!)