An enduring feature of the programme is the annual charity appeal, which asks viewers to collect items that can be recycled or sold to raise money for the chosen cause. For example, in 1973–74, Blue Peter sponsored a "Stampede", asking people to donate postage stamps in support of Ethiopian famine relief. This is always a charity project in the UK in odd-numbered years, and abroad in even-numbered. The appeal is usually launched in late November and runs through to February or March of the following year. Until 1979, only waste products were ever collected, such as stamps, linens, coins, scrap metal etc. In 1979, one of the most popular forms of raising appeal money was introduced, encouraging viewers to hold "Blue Peter Bring And Buy Sales" at which buyers are also encouraged to bring their own bric-a-brac or produce to sell. The Great Bring And Buy Sale was used every few years or so as a means of adding variety to the collecting theme during other years.
