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Signature fraternity events such as Derby Days always stirs up the best memories. It's a unique time when the brotherhood comes together and works hard to accomplish a goal. Signature fraternity events such as Derby Days always stirs up the best memories. It's a unique time when the brotherhood comes together and works hard to accomplish a goal. Share your story about Derby Days at This email address is being protected from spambots. You need JavaScript enabled to view it.. Please mention Sigma Chi at Penn in your email.