Final answer:
Auggie had an incident on Halloween, but the details are not provided. He made Summer promise not to tell anyone about it.
Step-by-step explanation:
Auggie had an incident on Halloween, but he made Summer promise not to tell anyone about it. The details of what happened to him on Halloween are not provided in the given information. However, Auggie's reluctance to share the incident suggests that it may have been something embarrassing or difficult for him.