The Michigan Urban Farming Initiative is working to transform empty land in Detroit and change lives. You can help that cause every Saturday during the Summer. MIUFI hosts work days from 10:00 a.m. until 4:00 p.m. There is no need to register. Volunteers can just show up at the group's headquarters, 7432 Brush St. in Detroit. Before each workday, a free one hour yoga class is offered.