Visit Audubon's McLane Center in Concord this weekend for Herb and Garden Day. The event, which is now in its 5th year, serves to educate the public on the various uses for herbs and natural medicine, native plant identification, organic gardening, permaculture, and traditional homesteading practices. Spend the day in workshops, perusing plant sales, checking out the herbal marketplace and more. Registration is required. Admission is $25.