Chicago's tax march is scheduled to begin at 10 a.m. April 15 — three days before the filing deadline of April 18 — at Michigan Avenue and Congress Parkway, said Brar, who is working with city officials on the permitting process and march route. More than 9,000 people have indicated they will attend the Chicago march, part of a national movement with events planned in Washington and other cities across the country to pressure the president to make his tax returns public.