Convocation

a meeting of a religious character as distinguished from congregation, which was more general, dealing with political and legal matters

Hence it is called an "holy convocation." Such convocations were the Sabbaths (Lev. 23:2, 3), the Passover (Ex. 12:16; Lev. 23:7, 8; Num. 28:25), Pentecost (Lev. 23:21), the feast of Trumpets (Lev. 23:24; Num. 29:1), the feast of Weeks (Num. 28:26), and the feast of Tabernacles (Lev. 23:35, 36). The great fast, the annual day of atonement, was "the holy convocation" (Lev. 23:27; Num. 29:7).

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