sThe Great Gatsby, secret extravaganza

Could you please tell me the literal (comedy? grand spectacle full of secrecy?) and figurative meaning of "secret extravaganza" in the following excerpt of the chapter eight of The Great Gatsby?

It was this night that he told me the strange story of his youth with Dan Cody—told it to me because “Jay Gatsby” had broken up like glass against Tom’s hard malice and the long secret extravaganza was played out. I think that he would have acknowledged anything, now, without reserve, but he wanted to talk about Daisy.

Thank you.