Bengal National Chamber of Commerce and Industry's (BNCCI) 29th trade fair committee chairman Sourajit Palchaudhuri said at the inaugural function that due to demonetisation the trade fair had been downsized.
Some 50-60 participants have pulled out citing demonetisation as the reason, BNCCI officials said.
State Urban development minister Firhad Hakim said "Demonetisation has affected the entire business community of the country including ours".
"You cannot suddenly change practice and also expect from people where banking facility is yet to reach," he said.
Exhibitors remained concerned over impact on spending by people due to currency supply in the hands of consumers while trying to adopt digital payment methods.
The fair would continue till January 1.