Answer
The event would not be a sellout.
Work Step by Step
At the price of $45, the original quantity demanded is 70 thousand. After subtracting 20 thousand off 70 thousand as the other World Cup game has lesser demand, the new quantity demanded would be 50 thousand. The quantity supplied is at 60 thousand. Thus, there would be a surplus of tickets of 10 thousand, and thus the event is not a sellout as there are 10 thousand empty seats.
