At the Childrens Day on May 5th, carp streamers are hung to celebrate the boys, who are supposed to grow as strong as the carps that can swim upstreams. The holiday may be on on May 5th, but the streamers are put up long before that. Places where you can expect to see them hung are from large poles at homes where boys live, or in long lines across rivers. Girls put up dolls on display at home on March 3rd.