Official function
An official function is either an event, such as a convention (meeting), that has an official purpose for one's employment, vocation or profession--whether run by a person, institution or governmental agency--or an official duty.
Attending events with official purposes is one of the duties of many persons in many organizations. Attending such events fall into categories of networking, protocol, information gathering, among others. Networking may involve an economic network, an entrepreneurial network, an old boy network, a social network, and a value network.
Official duties are those performed to to facilitate the achievement of one's occupational assignments. They may include ministerial and non-ministerial duties. They may include duties that are commonly performed, and duties that must be performed because of new circumstances.