It seems the phrase "how I attended an all-guy's mixer" primarily refers to a Japanese manga and anime series titled "How I Attended an All-Guy's Mixer" (Japanese: 合コンに行ったら女がいなかった話), which translates to "The Story of How I Went to a Mixer and There Were No Women There." The story centers around a college student named Tokiwa invited to a mixer by a female classmate. He and his friends expect to meet women but are instead greeted by three handsome men who turn out to be women crossdressing as part of their work at a butler hostess cafe. The series explores their interactions and growing relationships in this unexpected setting. If the question is about attending such a real-life mixer event exclusively for men, information is more limited, but the original context is fictional and related to this manga/anime story. Would the interest be more on the fictional story, or guidance on attending a social mixer event for men?