Interesting to speculate where Airventure would fall. When you consider the crowds, lines, busses, trams, forums, evening programs, etc, it probably qualifies as "Going to an amusement park" (Moderate-High Risk, Level 8) or "Attending a large music concert" (High Risk, level 9).
Of course, the large music concert is over in a few hours...not a whole week, like AV.
Ron Wanttaja