What government runs day to day affairs of those groups?

The day-to-day affairs of groups, such as local communities or regions, are typically managed by local or regional governments. These governments operate under the authority of national or federal governments but have the autonomy to make decisions regarding local policies, services, and regulations. They are responsible for managing public services, infrastructure, and community needs, ensuring that the interests of their constituents are addressed. Examples include city councils, county governments, and regional administrations.