Workday at Burnham Nature Sanctuary. Join Burnham Volunteers removing invasive weeds and grooming trail. Meet in the parking lot on the north side of 47th Street at Cornell Avenue a few minutes before 9 a.m. Long pants, long sleeves, closed-toed shoes, hats and sun protection are recommended. Work gloves, tools, drinking water and training are provided. For more information, call Kathleen Taylor at 773-924-2738.