Mark 6:21

“And when a convenient day was come, etc..] For Herodias; who had long sought and watched for an opportunity of avenging herself on John, and such a time Herod's birthday proved; though some think, that this phrase is the same with bwj wy, “a good day”; often used by the Jews for a festival, any one of their feast days; there is a tract in their Misna which bears this name; and that such a day was this. But not one of the festivals of the Jews was this, as either their passover, or pentecost, or feast of tabernacles, which Herod had no regard to; but his own birthday, which he kept as a festival, in eating, and drinking, and dancing; and so was a very opportune and seasonable time for…”

“A convenient day - Convenient for her purpose. His lords, captains, and principal men of Galilee - The great men of the court, the army, and the province. Mark 6:23”

“when: Gen 27:41; Sa2 13:23-29; Est 3:7; Psa 37:12, Psa 37:13; Act 12:2-4 his birthday: Gen 40:20; Est 1:3-7, Est 2:18; Pro 31:4, Pro 31:5; Dan 5:1-4; Hos 7:5; Pe1 4:3; Rev 11:10 Mark 6:22”