1) Assemble 2) Call together 3) Foregather 4) Forgather 5) French word used in English 6) Gather 7) Have a meeting 8) Meet 9) Meet formally 10) To call together 11) To come together 12) To convoke 13) To meet 14) To unite 1) Assemble 2) Convoke 3) Forgather 4) Gather 5) Meet 6) Reconvene 7) Sit 
• (v. t.) To summon judicially to meet or appear. • (v. t.) To cause to assemble; to call together; to convoke. • (v. i.) To come together; to meet; to unite. • (v. i.) To come together, as in one body or for a public purpose; to meet; to assemble.
To gather together for an official or formal meeting
Con·vene' intransitive verb [ imperfect & past participle Convened ; present participle & verbal noun Convenong .] [ Latin convenire ; con- + venire to come: confer French convenir to agree, to be fitting, O...Con·vene' transitive verb 1. To cause to assemble; to call together; to convoke. « And now the almighty father of the gods Convenes a council in the blest abodes. Pope. » 2. To summon judicially to meet or appear. « By the papal canon law, clerks . ....
Borrowed from French convenir, from Latin convenire.
[v] - meet formally
convene 1. To come or bring together; to come together; to assemble, or meet, especially for a common purpose. 2. To assemble for united action; to meet in a convention. 3. To come together in harmony; to harmonize, fit each other.
verb meet formally; `The council convened last week`
meet formally