A starting point is open statistical data from the City of Zurich.

We have revived and reconfigured the schlaumeier chatbot for the workshop with data about death rates in city neighbourhoods:

.. and could do the same for birth rates and migration.

Per @marco.sieber, we could also use the Geburten nach Statistischer Zone regarding Life as well as the Gastwirtschaftsbetriebe using spatial selections from e.g. Fidels WHERE2-API.