Помогите пожалуйста составить 11 вопросов по английскому к предложению People have been celebrating "buy nothing day"for over a decade now.

Спасибо, но здесь не правильно.1) For how long people have been celebrating2)For how many decades3) Who celebrates

1)When people have been celebrating "buy nothing day"?2)How much decade people have been celebrating "buy nothing day?3)Who celebrating "buy nothing day"?