Seems World Hepatitis Day has been moved from May 19 to July 28 2011.
http://worldhepatitisalliance.org/WorldHepatitisDay.aspx
http://en.wikipedia.org/wiki/World_Hepatitis_Day
"Following the adoption of a viral hepatitis resolution during the 63rd World Health Assembly in May 2010, World Hepatitis Day was given global endorsement as the primary focus for national and international awareness-raising efforts and the date was changed to July 28 (in honour of Nobel Laureate Prof. Blumberg, discoverer of the hepatitis B virus, who celebrates his birthday on that date).[11] The resolution resolves that:
"1. 28 July shall be designated as World Hepatitis Day in order to provide an opportunity for education and greater understanding of viral hepatitis as a global public health problem, and to stimulate the strengthening of preventive and control measures of this disease in Member States;"[12]"
Here's the Executive Board and President - seems a different fellow for the Americas than the one from last year who I recall was a rather controversial choice:
http://worldhepatitisalliance.org/TheWHA/Structure.aspx