Being an older generation autodidactic-philomath your assumption hurts me. I must tell you "I think you are missing out assuming we only like Classic-Rock, Cadillacs, and child rearing." :-)
Anyway, you will never know if you don't ask. It never hurts to ask questions of people. Active listening is important, but you only need to find the next point to ask another question about that interest you. Oldsters have children around, and those youngsters are interested in everything, that the relatives/friends become fascinated in as well. I am currently learning to enjoy modern music which my niece and nephew like that initially I found terrible. I started teaching one of my junior engineers about Scotch, and he is now more expert than me. I secretly watch gaming videos on YouTube too. So, you never know.
Also, these event's are for the group to get to know each other. Either, you boss or the someone in your work group will probably take you in hand and introduce you around, or at least they should. Plus, people want to talk to the new person and will probably try to approach you. If it's not going well approach your boss or someone you know and ask them who they think might be interesting for you to talk with about an interest or hobby you share.
Depending on where you are "Current Affairs" can be a double edged sword; avoid the subjects of "Sex, Politics, and Money." Here in the USA "Trump" is polarizing even within groups of like-minded people.
You might also try, if you get bored or intimidated, looking for the boisterous group and hover near the edge until you have something worthwhile to contribute, even a witticism will gain you a point, and you will learn a lot about your fellow employees just listening. You might hear something from someone that peaks your interest, and you can pull them aside and talk about later.
Also, go in the opposite direction and look for the quietest person, and strike up a conversation with them; quiet waters run deep, and often present the best conversations. Start with "Hi, I'm new. What do you do?" Then it is just a simple progression of who, what, where, how, why, etc. The quiet people also after some time might be trusted to tell you about the others in the office.
Also, remember that extroverts like introverts, who else is going to listen to us and ask questions? :-]