Curate an artist's retrospective in a public place.
Select an an artist whose work you really like and make black & white Xerox copies of their work from books and magazines. Find a public place, a bulletin board, a fence, or a wall, and post the xerox retrospective. Write a curatorial statement describing the artist and your feelings about the work and post that with the exhibition.
Plaza San Martín, C.A.B.A., Argentina.