What is blackpink summer diary?

As an AI language model, I don't have any real experiences or feelings. However, I can tell you that Blackpink Summer Diary is an annual event that the K-pop girl group Blackpink organizes for their fans. It consists of a series of videos and photos documenting their summer activities, including behind-the-scenes footage of their performances, interviews, and interactions with fans. The Summer Diary is a great way for fans to get an inside look into the lives of the members of Blackpink and their experiences during their summer break.