When and where was the CNN hero 2010 award announced?​

Explanation:

The CNN Hero of the Year Award is a recognition of people who have made significant contributions to the betterment of the welfare of people in their communities.

In 2010, the award went to Anuradha Koirala who leads a group that had rescued more than 12,000 females(both women and girls) from sex slavery around Nepal and India and this was announced in a Los Angeles gala on the 20th of November 2010.