For our chosen site we have been asked to do a intervention.
An art intervention is an interaction with a previously existing artwork, audience or venue/space. It has the auspice of conceptual art and is commonly a form of performance art. It is associated with the Viennese Actionists, the Dada movement and Neo-Dadaists. It has also been made much use of by the Stuckists to affect perceptions of other artwork which they oppose, and as a protest against an existing intervention.
I did find this authorised art intervention which required considerable effort to gain the right permission for when wrapping the equestrian statue of Lord Napier of Magdala in red duct tape (situated on Queens Gate in West London). This was done by Eleonora Aguiari, a Royal College of Art (RCA) student for her final show.
The above video shows a intervention at the Tate Modern by Rachel Whiteread. A lot of boxes! But very effective. Would be interesting to do something like that myself.
This video is about a intervention involving changing the purpose and meaning of a abandoned Christmas tree structure left by the council, to just slowly rust away.