Task: Question Generation
Input (English): Context : The 2015 Belgian Grand Prix (formally the 2015 Formula 1 Shell Belgian Grand Prix) was a Formula One motor race held on 23 August 2015 at the Circuit de Spa-Francorchamps in Spa, Belgium. 
Subject : 2015 Belgian Grand Prix 
Relation : point in time
Output (English): On what date did 2015 Belgian Grand Prix occur?