An illustration of the convention center building named McCormick Place on an orange background with black text above and below the illustration.
This is button from the Chicago International Trade Fair at the McCormick Place held in 1961 or a later year. The fair started July 25th and was held for 17 days. It had over 200 major exhibits from fifty foreign nations, two theaters, and an international aviation exhibit. The fair was previously held at Navy Pier.
The McCormick Place opened in 1961 and quickly showed its convention potential within the first 8 months it was open; it was large enough for the over 800,000 visitors to the International Trade Fair.
Sources: Schreiber, George (1961 April, 26). Describe 1961 trade fair in McCormick Pl. Chicago Daily Tribune. p. 12. http://archives.chicagotribune.com/1961/04/26/page/42/article/describe-1...
Schreiber, George (1961 July, 23). History in the making: McCormick Place draws millions in first few months. Chicago Daily Tribune. p. D18.