40-year-old educated youth party, how much do you want to say? There should be a lot of feelings, bitter or hard, sweet or not. I am really touched by the memories at that time, the experiences of these years, the yearning for the future, so many changes, and the rare gathering for so many years.
Maybe you're too serious. Maybe they just want to hear your voice and see your face. If you want to talk more, say a few words from your heart, make some jokes and recall the past, at least it will be a pleasure for you.