May Day demonstrations held throughout Portland May 1 is International Workers' Day, a traditional day for marches, demonstrations and rallies in the Portland area Author: KGW Staff Updated: 9:10 PM PDT May 1, 2021 PORTLAND, Ore. — May Day demonstrations took place throughout Portland on Saturday, and more are expected later in the day. May 1 is International Workers' Day, a traditional day for marches, demonstrations and rallies in the Portland area. In the morning, dozens gathered at Holladay Park in Northeast Portland to support the PRO Act, a bill that expands various labor protections related to employees' rights to organize and collectively bargain in the workplace.