Based on the context and the answer, generate a question. 

Context: He summoned his bottomless bag and started throwing them inside the bag . One of the small boxes he kept outside the bag , and when he grabbed his notebook calender , a small piece of paper sticking out of the top caught his eye . He opened it and noticed that the day 's date was highlighted . The date reminded him of something , but just could n't remember what .

Answer:

The date highlighted was special



What is probably true ?