Question: During what month does the author of "The Death and Life of Great American Cities" have her annual neighborhood walking tours? 
Sentence (from "Jane Jacobs"): Jane Jacobs {'1': ", '2': ", '3': ", '4': "} (born Jane Butzner; May 4, 1916 – April 25, 2006) was an American-Canadian journalist, author, and activist best known for her influence on urban studies, sociology, and economics.
Relevant evidence: No