1 Kings 12:32

32Jeroboam inaugurated a festival on the fifteenth day of the eighth month,
The eighth month would correspond to October-November in modern reckoning.
like the festival celebrated in Judah.
The festival he celebrated in Judah probably refers to the Feast of Tabernacles (i.e., Booths or Temporary Shelters), held in the seventh month (September-October). See also 1 Kgs 8:2.
On the altar in Bethel he offered sacrifices to the calves he had made.
Heb “and he offered up [sacrifices] on the altar; he did this in Bethel, sacrificing to the calves which he had made.”
In Bethel he also appointed priests for the high places he had made.

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