Most people sport stacking (multiple venue)
Who
World Sport Stacking Association (WSSA)
What
618,394 people
Where
Not Applicable This will actually be an international attempt with 30+ countries involved.
When

The most people sport stacking in multiple venues was achieved by 618,394 participants at the tenth annual WSSA STACK UP! organized by the World Sport Stacking Association (USA) in celebration of Guinness World Records Day on 12 November 2015.

The 618,394 stackers represented 2,691 schools and organizations from 30 countries: Australia (306), Canada (37,808), China (664), Colombia (320), Denmark (369), Germany (945), Hong Kong (209), Hungary (7,115), Iceland (106), Indonesia (72), Ireland (143), Israel (3,519), Korea (1,898), Malaysia (443), Malta (592), Mexico (658), New Zealand (383), Philippines (35), Poland (481), Portugal (624), Romania (1,155), Saudi Arabia (100), Serbia (154), Singapore (911), South Africa (175), Spain (2980), Switzerland (2,290), Taiwan (4,910), United Arab Emirates (50), United Kingdom (1,202), United States (547,777).