Question: During what month does the author of "The Death and Life of Great American Cities" have her annual neighborhood walking tours? 

Context articles: Heavy Seas Beer
Gate to the Northwest Passage
Big Onion Walking Tours
Pat Liddy
Art Murmur
Patchin Place
Jane's Walk
Jane Jacobs
Blue Badge tourist guide
City Sightseeing

Heavy Seas Beer is brewed by Clipper City Brewing Company, in Baltimore, Maryland.
 The brewery was established by Hugh Sisson in 1995.
 Previously, Sisson operated Maryland's first brewpub, Sisson's.
 In 2010, the brewery rebranded.
 While the name of the company remains Clipper City Brewing Company, all of its beer falls under the Heavy Seas brand.
 Heavy Seas hosts tours on most weekends.
 It is located at 4615 Hollins Ferry Road, Suite B, in the Halethorpe section of Baltimore.
 Heavy Seas currently offers a variety of beer styles in approx. 18 states within the United States.
 Several Heavy Seas beers have been awarded and include the following: Cutlass Amber Lager (a repeat medal winner at the Great American Beer Festival from 2006-2010, bronze medal winner at the 2010 World Beer Cup and silver medal winner at the 2012 World Beer Cup as Heavy Seas Märzen), Powder Monkey Pale Ale (silver medal winner at the 2008 Great American Beer Festival and bronze medal winner at the 2010 World Beer Cup as Heavy Seas Pale Ale), Small Craft Warning Uber Pils (bronze medal winner at the 2004 Great American Beer Festival), Gold Ale (gold medal winner at the 2010 World Beer Cup, bronze medal winner at the 2010 Great American Beer Festival and bronze medal winner at the 2014 Great American Beer Festival as Heavy Seas Gold Ale) and Winter Storm Imperial ESB (gold medal winner at the 2008 World Beer Cup).
Gate to the Northwest Passage is a 1980 sculpture by Alan Chung Hung, located adjacent to the Vancouver Maritime Museum in Vanier Park in the Kitsilano neighborhood of Vancouver, British Columbia, Canada.
 The 4.6 m sculpture of a square, cut and twisted "like a paper clip" to form an arch, is composed of weathered Corten steel that rusts to provide a protective layer.
 The work was installed in 1980 to commemorate the arrival of Captain George Vancouver in Burrard Inlet, following a competition sponsored by Parks Canada one year prior.
 "Gate to the Northwest Passage" received an adverse reaction initially, but reception has improved over time.
 The sculpture has been included in walking tours of the surrounding neighborhoods as a highlight of Vanier Park.
Big Onion Walking Tours is the largest walking tour company in New York City.
 The company has offered sidewalk tours of the city since 1991.
 Big Onion shows visitors & tourists alike the diverse fabric of urban neighborhoods, using as guides current doctoral students (or recent PhD's) who are studying history or closely related fields.
Pat Liddy (Irish: Pádraig Ó Lideadha, born 1944 in Dublin) is an Irish artist, historian, writer, illustrator, broadcaster, mapmaker, and environmental lobbyist who has helped make Dublin a global tourist attraction.
 The author and illustrator of over seven books on the city, as well as others on Irish cultural sites, he is the walking tour operator of Pat Liddy's Walking Tours of Dublin.
Art Murmur is a night of open galleries held the first Friday of each month primarily in the Uptown, Koreatown/Northgate, downtown, and Jack London neighborhoods of Oakland, California, drawing 25,000 people.
 The event began in 2006 at the intersection of 23rd Street and Telegraph Avenue.
 In 2012, the street festival component was taken over by local community groups and the City of Oakland, becoming the "Oakland First Fridays″ street festival along Telegraph Avenue.
 The Oakland Art Murmur organization has since refocused its energies as a community of diverse art spaces throughout the City of Oakland, offering additional programming such as a weekly Saturday Stroll art walk and monthly guided walking tours.
Patchin Place is a gated cul-de-sac located off of 10th Street between Greenwich Avenue and the Avenue of the Americas (Sixth Avenue) in the Greenwich Village neighborhood of Manhattan, New York City.
 Its ten 3-story brick row houses, said to have been originally built as housing for the Basque staff of the nearby Brevoort House hotel, have been home to several famous writers, including Theodore Dreiser, E. E. Cummings, John Cowper Powys and Djuna Barnes, making it a stop on Greenwich Village walking tours.
 Today it is a popular location for psychotherapists' offices.
Jane’s Walk is a series of neighbourhood walking tours.
 Named after urban activist and writer Jane Jacobs, Jane's Walks are held annually during the first weekend in May to coincide with her birthday.
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.
 Her influential book "The Death and Life of Great American Cities" (1961) argued that urban renewal did not respect the needs of most city-dwellers.
 In the book she introduced sociological concepts such as "eyes on the street" and "social capital".
Blue Badge Tourist Guides are the official, professional tourist guides of the United Kingdom.
 They wear a Blue Badge to indicate their professionalism.
 They are recognised by local tourist bodies throughout the UK, and by Visit Britain as Britain’s official tourist guides.
 There are over 2000 Blue Badge guides in England, Scotland, Wales, and Northern Ireland, who guide at Britain's tourist attractions and cities.
 Some guides run guided walking tours on themes such as Jack the Ripper, Harry Potter and The Beatles.
 They are responsible for the regular 2012 Summer Olympics walking tours and are the guides for the summertime public tours inside the Houses of Parliament.
City Sightseeing is the World's largest open-top, double-decker sightseeing tour bus operator.
 It provides tour bus services in more than 130 cities around the world.
 As City Sightseeing has grown and expanded, the company now also provides boat tours, sightseeing train tours, and guided walking tours.