‘Holy convocations’ appears in the original Hebrew as ‘Mikra’ei Kodesh’ {מקראי קודש} (or ‘Mikra Kodesh’ {מקרא קודש} in the singular form) and can be found in the biblical description of almost every holy day. The English translation of this Hebrew term is based on the appearance of this phrase once more in the Book of Isaiah:

The English word “convocation” found often in Leviticus 23, is a translation from the Hebrew word “miqra.” The word is used nearly exclusively in the context of the mo’edim, or YHWH’s appointed days such as Passover or the Sabbath, and usually translated as convocation or assembly in most English Bible translations.