NEW YORK--(BUSINESS WIRE)--Argyle Executive Forum LLC (“Argyle”), host of more than 200 events attended by over 7,000 Fortune 500 business leaders annually, today released their calendar of 2016 Leadership Forums serving the needs of C-level business leaders of the largest companies in the U.S. With more than 90 percent of the Fortune 100 attending an event in 2015, Argyle Leadership Forums have become the go-to resource for executives looking to solve critical business challenges through thoug