Eleazar ben Azariah was a 1st-century CE Jewish tanna, i.e. Mishnaic sage. He was of the second generation and a junior contemporary of Gamaliel II, Eliezer b. Hyrcanus, Joshua b. Hananiah, and Akiva.
Hakhel is a biblical commandment to assemble all Israelite men, women and children and converts, to hear the reading of the Torah by the king of Israel once every seven years to strengthen their fear