The debate over whether there's a glut of trade shows in a particular space was raging long before tech shows began falling by the wayside in recent years. Forty-five years ago, John F. Corkery, VP of Thor Power Tool Co., Aurora, Ill., addressed the topic:
"There are many trade shows that reach your market, national and regional, just as there are many trade publications. Perhaps there are too many of both. With few market exceptions, there is one good one. Perhaps two. Seldom three."
Source: BtoB predecessor Industrial Marketing, September 1959, page 59.