2.20 17 World Blood Donor Day Date: 2017 June 14 Wednesday (May 20th of Ding Younian (Year of the Rooster)).

3. I chose this day because June 14 is the birthday of Karl Landsteiner, the Nobel Prize winner who discovered ABO blood group system. The theme of the first World Blood Donor Day was "Donate blood, give your life". Thank you all. Its purpose is to thank those unpaid blood donors who have saved millions of lives, especially those individuals who have donated blood regularly for many times, and to celebrate their selfless dedication to blood donation; At the same time, I hope that the whole society will arouse a wider understanding of the importance of voluntary blood donation, encourage more people, especially young people, to become qualified regular blood donors, and provide the safest blood that can be used when it is necessary to save lives.