convocation
Concise Oxford English Dictionary © 2008 Oxford University Press:
convocation /ˌkɒnvəˈkeɪʃ(ə)n/
▶noun
- 1 (in the Church of England) a representative assembly of clergy of the province of Canterbury or York.
- 2 Brit. a legislative or deliberative assembly of a university.
■ N. Amer. a formal ceremony for the conferment of university awards.
- 3 the action of convoking a large formal assembly.
– derivatives
convocational adjective.
convocational adjective.
'convocation' also found in these Oxford entries:

