Task: Question Generation
Input (English): Context : The 2015 Canadian Grand Prix, formally known as the Formula 1 Grand Prix du Canada 2015, was a Formula One motor race held on 7 June 2015 at the Circuit Gilles Villeneuve in Montreal, Canada. 
Subject : 2015 Canadian Grand Prix 
Relation : point in time
Output (English): What is the date when 2015 Canadian Grand Prix happened?