MONTPELIER — In 2009, the Vermont Workers’ Center convened the first-ever May Day rally as a way of demonstrating political support for single-payer health care.

Four years later, this annual “day of action” will include a call for increased government spending on programs to improve the lot of poor and working-class Vermonters. James Haslam, director of the Vermont Workers’ Center, said he expects “thousands” to show up for a daylong event Wednesday that will include a rally on the Statehouse lawn.