Every year, countries throughout every region of the world organize a huge variety of events and activities to celebrate the day, from football matches to free concerts, and from mobile blood donation clinics to monumental decorations.
WHO and partners are encouraging communities everywhere to join the World Blood Donor Day 2011 campaign and “Paint the world red”, whether by symbolically colouring, covering or lighting monuments, popular landmarks and buildings in red; staging artistic, cultural or musical events with a red-coloured theme; or forming a "human blood drop" in prominent public places.
Source WHO