Try to get the conversation focused on problems that need solving, unmet needs that must be addressed. Demonstrate there in the meeting the value you could add. This could help you be seen as a potential hire or make you more appealing as someone to refer on to other colleagues. Gift your networking companion. Mark your spot on the Job Development Timeline.
Some people are reluctant to visit a company unless there is an actual job opening advertised.
But jobs don't develop out of thin air. Long before a job description is created there is a mountain of work that's not getting done. If you step into the picture early enough in the process, there will be no need to advertise a job opening. You'll be the sole candidate considered. This is especially true of small to medium companies.