at MIT often choose to feature Tim as their mascot, and go by the name "The Engineers". Recurring events Bad Ideas Festival This event, which usually takes place between the parallels of the East Campus dormitories, features oddball activities, stunts, and constructions. Notable Bad Ideas events include temporary roller coasters and the Green Building Challenge. The event takes place during the last weekend of January. Baker House Piano Drop Each spring, the denizens of Baker House drop an old, irreparable piano off the roof to let it plunge six stories onto the ground, to celebrate Drop Date, the last date one can drop classes at MIT. The resulting dent in asphalt has spawned a unit of volume, known as the Bruno. Campus Preview Weekend Campus Preview Weekend (CPW) is a relatively new event sponsored by the Admissions Office, which invites recently admitted high school students to visit the campus before deciding whether or not to attend MIT. Invited students can sample classes, tour the campus, attend special events, and stay overnight with MIT students. The first fully inclusive event was held in 1999. 2013's CPW was held around early to mid April. East Campus Rush Immediately before the beginning of Fall term, during Orientation Week for new students, residents of East Campus dormitory construct large-scale temporary structures, such as a roller coaster, in the space between the parallel wings of the residence. These projects are large enough that the City of Cambridge requires detailed engineering drawings in advance, plus a letter from a licensed engineer certifying that the design conforms to local building codes. Independent Activities Period Independent Activities Period (IAP) is a four-week-long inter-semester "term" offering hundreds of optional classes, lectures, demonstrations, and other activities throughout the month of January between the Fall and Spring terms. The final event is a half-day "Charm School" sponsored by the Student Activities Office. The first IAP was in 1971. DTYD (Dance Till You Drop) Dance (previously Drink) Till You Drop (DTYD) is an annual party, hosted by the Burton-Conner living group the Burton 3rd Bombers, which is typically held the Sunday of Patriot's Day weekend in the Burton-Conner House Porter Room. The party has been traditionally accompanied by a hack and hosted live music, and is open to the entire campus. First hosted in 1969, the event celebrated its 50th anniversary in 2019. Ring events The Brass Rat undergraduate ring is designed