Chapter 6 is a bit of an odd chapter. The story is about Jonas; however, chapter 6 is not about the Ceremony of the 12. There are ceremonies happening, but they are for the younger kids. Much of the chapter has Jonas reminiscing about previous ceremonies and/or rumors about people and certain results of ceremonies. We also get to see a bit of the attachment that Jonas is already forming with Gabriel.
The chapter takes place over two days because the ceremonies apparently take long enough to have to be split into two parts. The chapter ends right before Jonas's ceremony begins.
With that overview in mind, I think an appropriate title should be something about ceremonies or memories. Additionally, a chapter title should be kept fairly short.