The LOCATION@1 convened a 13-nation conference of the ORGANIZATION@1 in NUMBER@1 in LOCATION@2 , LOCATION@3 in response to increasing criticism of the opium trade .

The LOCATION@1 organised a conference between NUMBER@2 countries called the ORGANIZATION@1 in NUMBER@1 in LOCATION@2 , LOCATION@3 because people complained more and more about opium trade .
