When you go out to dinner with friends, you'd better take your girlfriend with you, because it is a kind of performance of loving your girlfriend. You can take him to know your friends, improve mutual understanding, and better understand his previous life through his friends.
Better not! Homecoming is your friendship meeting. You should go there with your classmates and bring your target. Your target will be embarrassed when he or she doesn't know what to do, especially if he or she is introverted. Besides, they don't know each other, and you are also embarrassed.
Boyfriends must be brought to the gathering of girlfriends. These girls may have just been with their boyfriends and they are still in love, so they don't want to be separated and want to be together all the time. So they will also choose to bring their boyfriends to the gathering. But normally, it is better not to bring their boyfriends to the gathering of girlfriends.