In a socratic method, you're forced to use your critical thinking and analyze all possible weakness for every answers before you are making a conclusion.
Rather than basing your decision on a pure belief such as religion or norms, using Socratic method will provide you with a more objective and rational results.
When implementing this method to create concepts like justice and piety, it will create a set of laws/regulations that benefited the majority of people in different groups rather than accommodating the people with a certain race or religion. This will make the people who practice it become happier and virtuous.
The answer to your question is Celebrates the Exodus, the freedom from slavery of the Children of Israel from ancient Egypt that followed the Ten Plagues.