The word for today is…
convocation (noun) – 1. (a) The act of convoking (having a formal meeting).
(b) A group of people convoked, especially the members of a college or university community who are assembled for a ceremony.
2. A clerical assembly of the Anglican Church similar to a synod but assembling only when called.
3. (a) An assembly of the clergy and representative laity of a section of a diocese of the Episcopal Church.
(b) The district represented at such an assembly.
Source : The Free Dictionary
Etymology : Late 14th century, “assembly of persons,” from Old French convocation and directly from Latin convocationem (nominative convocatio), noun of action from past participle stem of convocare “to call together,” from com- “together” + vocare “to call,” from vox “voice”.