term:

Convention

convention n

1 : an agreement between nations for regulation of matters affecting all of them
2 : an agreement enforceable in law
: contract
3 : an assembly of persons met for a common purpose
;esp
: a meeting of the delegates of a political party for the purpose of formulating a platform and selecting candidates for office

Source: Merriam-Webster's Dictionary of Law ©1996. Merriam-Webster, Incorporated. Published under license with Merriam-Webster, Incorporated.