Non-profit organisation Assemble have constructed a temporary canal-side cinema under a London motorway flyover. Folly for a Flyover was assembled by a team of volunteers over the course of a month, using reclaimed and donated materials. It remains in place for six weeks, staging a series of movies and performances as part of the Create festival.
This particular example is one of the successful design which attract people in that area, yet the function of the space is for leisure. In my opinion to attract people in political purposes is much harder than that, where most people are not interest by it.
Compare that percentage that people interest in different kind of media.
Power of People
Television: Master Chef - Political Talk
Magazine: Sports/ Gossip - Politic Issue
Event: Music event - Political Speech
http://www.dezeen.com/2011/07/05/folly-for-a-flyover-by-assemble/
http://www.dezeen.com/2011/07/05/folly-for-a-flyover-by-assemble/