The choice of the date Oct 20, 2010 is explained on the International Statistical Institute's website as follows:
The date 20-10-2010 was chosen since the year rounding in '0' has always been an important year in official statistics. In many countries, this is the year when the population and housing census is conducted. It is also the base year for the trend analysis in economic statistics or in compilation of national accounts or input-output tables. In 2010, some 3 billion people will be counted in some 60 countries. This is why we choose 20-10-2010 to emphasize the importance of this year in official statistics calendarBhutan's National Statistics Bureau celebrated the event with a program on "The role of statistics towards supporting evidence-based decision-making in the country."
As a statistician, I would have loved to attend this event. However, I was conducting another related event: The first day of a 3-day workshop on Decision Making Using Excel. The workshop aim is the same as the NSB's event: to promote evidence-based decision making. The workshop is attended by 20 decision makers from government, corporate, and private organizations in the country. The workshop highlights the usefulness of data for planning and evaluating projects, and for interpreting and presenting data effectively.