Krystal Garcia (left), a research project assistant in the Henry M. Goldman School of Dental Medicine’s health policy and health services research department, and Flor Amaya (SPH’13) sort canned vegetables at the Greater Boston Food Bank during the fourth annual Global Days of Service.

Garcia and Amaya were two of the thousands of alumni, faculty, staff, and students taking part in the event this year, which expanded from one day to the entire month of April to give more people an opportunity to participate. There were volunteer sites around the world, from Boston to Shoreline, Ore., and Montreal, Canada, to Sydney, Australia. Wrapping up the Global Days of Service was the Hubie Jones Lecture in Urban Health on April 27, delivered by physician Adewale Troutman, a human rights, health equity, and social justice activist and president of the American Public Health Association.