Flash mob at Copenhagen train station

"Not to be missed! On May 2, 2011, the Copenhagen Philharmonic amazed commuters at the Copenhagen Central Train Station, as they created a kind of orchestral "flash mob" – performing Ravel's famed Bolero, with the musicians gradually assembling in place as the work progresses. The video – which shows not only the assembling orchestra, but also the delighted faces of the commuters – has generated overwhelming interest, and indeed has exceeded the orchestra’s expectations. We hope you enjoy it as much as we do! "
Check the video at: http://www.classicalarchives.com/feature/dont_miss_this.html

What I find inspiring here for this challenge is how the experience of the train station  and the commute associated with it (which is not necessarily positive and / or exciting) is transformed by the performance of Ravel's Bolero by the musicians. The space here is inhabited by the performers but also create a new environment and experience to the commuters. What kind of activities (not necessarily performance, but art could be an option to explore) can create this new experience of the space?
One can think of the jazz concerts sponsored by BAM in summer at MetroTech: I am always amazed by the crowd that suddenly emerged (not that many NYU-Poly people - students, staff or faculty - though) and how the plaza can become lively...