On Sunday morning, Simon writes a lengthy email to Blue. He says he knows who Blue is on the inside, even if he doesn't know who exactly Blue is in real life. Simon says that he wants to take chances and put his heart on the line now. He confesses that he really likes Blue and truly wants to get to know him. Simon writes that there's a carnival tonight; he'll be there at 6:30 P.M., and he hopes Blue will come.
When Simon gives Blue the decision to show up or continue to remain anonymous, it suggests that actively choosing to cede control of a person or a situation can have positive outcomes. Insisting he knows Blue on the inside shows that Simon is abandoning some of his assumptions about who Blue is.