convention · noun /kənˈven.tʃən/
convention (MEETING)
C1 C a large formal meeting of people who do a particular job or have a similar interest, or a large meeting for a political party
Dictionary examples:
the national Democratic convention
Where are they holding their party convention?
Learner example:
Conference facilities: Being completely renovated, the historic building of Edessa's Cultural Association is the ideal place for a modern scientific convention. (Certificate in Advanced English; C1; Greek)
convention (CUSTOM)
C1 C or U a usual and accepted way of behaving or doing something
Dictionary example:
In many countries it is the convention to wear black at funerals.
Learner example:
Nowadays, people tend to avoid traditions and conventions. (Certificate in Advanced English; C1; Czech)