convention
/kənˈvɛn.ʃən/
A meeting or gathering.
The convention was held in Geneva.
A formal deliberative assembly of mandated delegates.
The EU installed an inter-institutional Convention to draft a European constitution.
The convening of a formal meeting.
A formal agreement, contract or pact.
A treaty or supplement to such.
The Vienna convention at the Vienna Congress (1814-15) standardized most of diplomatic conduct for generations.
A practice or procedure widely observed in a group, especially to facilitate social interaction; a custom.
Table seatings are generally determined by tacit convention, not binding formal protocol.