Not marketing. Roving Gang of Grannies Tag Blighted Buildings With Amazing Graffiti. “Lata 65, a group of Portuguese artists, decided to organize a team of volunteers to teach senior citizen women how to make their own street art.” — read article on Good.
Their Facebook icon:
Wikipedia defines “a marketing activation as the execution of the marketing mix” or a mix of approaches and technologies used / needed to reach the audience. “Depending on the business objective, marketing activation can be used as part of a marketing strategy.’ That includes “brand activation, sometimes called brand engagement which focuses on building a longer term emotional connection between the brand and the customer.” After identifying the audience a marketing strategy can be to focus in “on some fewer influencers only, activation can become more efficient and higher returns can be expected.” 
Thank you Ommie! Advertising agency Thinkmodo in NYC created 3 human shaped RC planes and flew them around New York City to give the illusion that people were flying around the city to promote the opening of the film Chronicle.
Thank you Karalie!
Thank you Hallie! BBDO New York for Snickers, You make mistakes when you are hungry.
“While visiting the Louvre last last year, artist and filmmaker Julien de Casabianca was struck by an Ingres painting of a female prisoner tucked unceremoniously into a corner of the museum. He suddenly had an idea: what if he could somehow free her—both figuratively and literally—by reproducing her figure on a public street.”
“Since sharing photos of the first artwork online, people in at least 18 cities have liberated similar anonymous characters found in master paintings and pasted them up in public spaces in London, Barcelona, Chicago, Rome, and elsewhere. Casabianca says the global participation was completely unplanned and unexpected but he’s embraced the idea wholeheartedly.”