Local events as fine tuning?

I am using GPT4-turbo as an Assistant for elder people, interacting with the user. Actually I’m using threads/runs and I have a different thread for each user, trying to personalize replies. I wonder wich is the correct and best way to give local information to user, like painting exhibition or theater show in the city of the user.
I am not sure I can find an external service to use an API to retrieve info, so have I to submit a fine tuning model with local information?

I’d like that GPT-4 can answer to “when is that XYZ exibition in my city WYX ?” with correct info. I already have in the prompt the user’s name, city, and local info.
Thanks