So the magicians were assembled at a stated time and place on an appointed day.
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Tafseer
'Abdullāh Ibn 'Abbās / Muḥammad al-Fīrūzabādī
تفسير : (so the wizards were gathered together) there were 72 of them (at a set time on a day appointed) which was the day of the market, and it also said that it was the day of their festival, and it is also said that it was the day of their new year.
Jalāl al-Dīn al-Maḥallī
تفسير : so the sorcerers were assembled at a fixed time of a known day, which was the morning of the festival day.