Final answer:
The negation of the statement "someone did not go to the football game" is "everyone went to the football game".
Step-by-step explanation:
The negation of the statement "someone did not go to the football game" would be "everyone went to the football game". The original statement states that at least one person did not go to the game, so the negation would mean that every person attended the game. This can be interpreted as the opposite of at least one person not going, meaning that all individuals were present.