Does 'Return the completed card with your check by October 15 to receive an invitation to a special artist dinner on November 8.' stand independently of the premise 'You will receive an invitation to a dinner if you return the completed card.', neither following nor contradicting it?
Return the completed card with your check by October 15 to receive an invitation to a special artist dinner on November 8.###You will receive an invitation to a dinner if you return the completed card.