The 6th Annual Barbara J. Walker Butterfly Festival at Broad Meadow Brook will be held Aug. 10, from 10 a.m. to 4 p.m. Rain date: Aug. 11. Enjoy educational fun for all ages at Broad Meadow Brook, 414 Massasoit Rd., Worcester, where butterflies fly free in their natural habitats. The day's activities include naturalist-led walks, live caterpillars, butterfly art, face painting, children's activities, butterfly garden tours and observation stations, butterfly plant sales, vendors, music, food, and much more. Come in costume and get a prize! Fee: $5/person (ages 3 and above); $4 Mass Audubon members; $20 maximum per family. Visit www.massaudubon.org/Nature_Connection/Sanctuaries/Broad_Meadow/news.php?id=1428&event=no for more information.