paint the Fence must station two representatives, or "guards", on the small gravel region surrounding it. As long as two guards remain within the boundary, no other group may "take" the Fence. This sometimes leads to groups setting up a tent or campsite just inside the boundary so that they may "hold" the fence for an extended amount of time. It is also unwritten etiquette that if another group needs the Fence to advertise one of their upcoming events, the current holders should turn the Fence over to that group. This often leads to extended periods of time when the Fence is passed between groups in an organized fashion. On March 21, 2011, six freshman Carnegie Mellon students defaced the fence. They were stopped by fellow students, CMU Police Officers, and representatives from the Office of Student Affairs. A hacksaw was used to cut away over two years' worth of layers of paint. The following night, hundreds of CMU students helped paint the fence in an effort to "heal" it. Facilities Management Services has taken the responsibility of repairing the fence. Instead of gluing it back together, the chunks were removed on March 23, leaving dozens of different layers visible. The Fence is used not only to advertise upcoming events for a variety of organizations, but also to recognize different political views, religious or ethnic holidays, as well as support those on campus that may feel underrepresented. Spring Carnival Usually held in April, Spring Carnival is the biggest event of the Carnegie Mellon school year. Students have a four-day weekend to enjoy the Carnival festivities. Many students work hard all year to make it a success, and the Pittsburgh community is invited to attend. Alumni often return for the festivities, and Reunion coincides with the weekend. Spring Carnival features "Midway", with all the standard carnival attractions, and a Buggy race which is run over the course of the weekend. Many organizations across campus construct both a booth for Midway and a buggy for Sweepstakes. Judges decide on winners in several different categories. Buggy races Buggy, officially called Sweepstakes, is a race around Schenley Park. It can be thought of as a relay race with five runners, using the buggy vehicle as the baton. Entrants submit a small, usually torpedo-shaped, vehicle that is pushed uphill and then allowed to free-roll downhill. The driver (who–like all participants–must be a Carnegie Mellon student,