Translation of the verse 38 from Surah Ash-Shu‘ara’ : Number of verses 227 - - page 368 - Part 19.
So the sorcerers were assembled at a fixed time on a day appointed.
So the magicians were assembled for the appointment of a well-known day.
(26:38) So, the magicians were gathered together on an appointed day and time, *31
*31) As already mentioned in Surah Ta Ha (v. 59), the day fixed for the purpose was the day of the national festivities of the Egyptians so that large crowds of people coming to the festivals from every part of the country should also witness the grand "contest which was to be held in the broad daylight so that the spectators could see the performances clearly.
Source : Ash-Shu‘ara’ Verse 38: So the magicians were assembled for the appointment of a well-known day.