Reddit mentions of The New Urban Sociology

I would second this, for sure.

Consider also The New Urban Sociology by Gottdiener and Hutchison, and generally anything by Mark Gottdiener. This does not directly address idea generation, so much as urban culture and the changing nature of cities. In that respect, it deals with how culture and politics shape urban life.

If you want to go back to some classical theory, you could check into Durkheim (collective effervescence) and any contemporary literature in the same vein.