What is the theme of chapter 13?

DEffinetly the significance of the meal is the theme in this chapter.

Throughout Great Expectations, Dickens uses meals as a reflection of the relationships at hand. The meal celebrating Pip's indenture is reminiscent of the Christmas meal in Chapter 4, where Pip feels none of the enjoyment, human companionship, and hospitality that is supposed to accompany meals. What is significant about these meals among friends is what they are not. The uneaten meal and cake in Miss Havisham's banquet hall stands as a starkly direct symbol of the lack of love and human companionship that meals commonly signify.