Many cities and towns celebrate Christmas by putting up decorations. These may be banners and bunting which are strung from buildings or lampposts. They may be Christmas lights which can also decorate buildings and street trees. Many large cities put up a huge Christmas tree in a public place, such as those in Trafalgar Square in London, Times Square in New York and Martin Place in Sydney. This is often combined with an appeal to the people of the city to give money or gifts to help the poor and needy.