What date signifies the anniversary of the rebellion?

The anniversary of the rebellion in George Orwell's "Animal Farm" is celebrated on Midsummer Eve, which is significant for several reasons. This date marks the moment when the animals successfully overthrow Mr. Jones and take control of the farm, symbolizing their victory over human oppression and the hope for a new beginning.

Midsummer Eve has a sense of warmth and fertility associated with the summer solstice, reflecting the animals' aspirations for a better life. The celebration around this date also serves to reinforce their unity and the ideals of Animalism, as they remember the struggles they went through to achieve their freedom. This moment of celebration contrasts with the despair and control they faced under human leadership, thus making it a poignant reminder of their revolutionary spirit.

The other options do not hold this significance. Christmas Day is often associated with human traditions, while Harvest Day is focused on agricultural success rather than the rebellion itself. The Winter Solstice, despite being a date rich in various cultural traditions, does not bear the relevance that Midsummer Eve does in relation to the events of the story.