Introverts don't like wasting time. Introverts want action. Introverts are doers.
They're not going to sit around talking about the weather, but bring them to a place of shared interest and they turn on. They are bright and talkative and will control the conversation. They ask the most interesting and thoughtful questions and will have people sharing more than the usual small talk. Introverts crave interesting things.
Got an introvert in your life? Discover their passions and engage them about it. Is your introvert into Art? Auto mechanics? Theater? Books? Museums? Baseball? Football? Go there. Talk about it, visit it, find out more about it.
That's the secret.