0 a large formal meeting, especially of Church officials or of members of some universities in the UK: --
a university convocation
1 a large, formal meeting, esp. for the ceremony at a university at the end of a course of study, or the act of arranging a large, formal meeting: --
Convocation can define the laity now.
Convocation may be an antiquated assembly, and it may be unrepresentative to the extent that for an historical reason the unbeneficed clergy are not members of it.
I am sorry to note that the representation of the convocation has been increased from eight to 10.
Convocation is summoned by the archbishop, who is a spiritual authority.
Convocation would prepare the scheme and decide the original constitution.
Convocations have been held biannually since then.
From time to time, the different organizations sponsor convocations and open forum on subjects of current interest; notable speakers with special knowledge of the topic are usually invited.
They have trimonthly convocations which include sermons and songs.