Convocation, from the Latin (some English words originated from Latin words; Latin is not a "Biblical language" as some claim or believe however - the Scriptures were written in Hebrew, Greek and Aramaic) words con, meaning to, and voke, meaning vocal, or to call, means a summoned assembly. The difference between a convocation and a congregation may be illustrated in the statement "the congregation attends the convocation." A congregation is a group of people with a common faith, while a convocation is a gathering in response to a summons. Throughout Bible History, "convocation" was used specifically and exclusively for God's Holy Days that God commanded to be Holy convocations.
The original Hebrew word that is translated as "convocation" is (pronounced) mik-raw means a called assembly. Another literal meaning of the original Hebrew word is a rehearsal - rehearsal meaning to "re-hear" what has been taught, but the modern-day accepted meaning of rehearsal, a practice session for a later event is also very appropriate because all of the so-called "Old Testament" Holy Days are prophetic in intent (they are not an end or purpose in themselves), until they are fulfilled, and are then memorials forever thereafter. The "spring" Holy Days (Passover, Unleavened Bread, Pentecost - see below) have been largely fulfilled (the Sacrifice of the "Lamb of God" and the founding of the Christian Church), while the "autumn" Holy Days (The Feast of Trumpets, The Day of Atonement, The Festival of Tabernacles and the Eighth Day - see below) portray events awaiting to happen, beginning with The Return Of Jesus Christ.
A Convocation Is A Commanded Gathering Of The Congregation
11 'I will also cause all her mirth to cease, her feast days, her new moons, and her sabbaths, and all her solemn feasts.'
7 'Purge out therefore the old leaven, that ye may be a new lump, as ye are unleavened. For even Christ our passover is sacrificed for us:'
8 'Therefore let us keep the feast, not with old leaven, neither with the leaven of malice and wickedness; but with the unleavened bread of sincerity and truth.'
In these verses the author speaks of keeping the Passover feast. This is AFTER YAHUSHUA has been crucified.