Final answer:
August feels sad and a little bit happy after his school tour.
Step-by-step explanation:
August feels sad and a little bit happy at the same time after his school tour because he is experiencing mixed emotions. This can be compared to the feeling of laughing and crying at the same time, known as a 'laughing-crying feeling.' It's possible that August feels sad because the tour is over and he's leaving behind something he enjoyed, but he also feels a tiny bit happy because he had a positive experience during the tour.
As for whether I have ever felt this way, yes, there have been times when I've experienced mixed emotions. For example, when saying goodbye to friends at the end of a school year, I may feel sad to be leaving them behind but also happy to have made great memories together.