ʿUkaz, Majanna and Dhul-Majaz were markets in the Pre-Islamic period. When the people embraced Islam they considered it a sin to trade there. So, the following Holy Verse came:-- 'There is no harm for you if you seek of the bounty of your Lord (Allah) in the Hajj season." (2.198) Ibn ʿAbbas recited it like this.  

كَانَتْ عُكَاظٌ وَمَجَنَّةُ وَذُو الْمَجَازِ أَسْوَاقًا فِي الْجَاهِلِيَّةِ فَلَمَّا كَانَ الإِسْلاَمُ تَأَثَّمُوا مِنَ التِّجَارَةِ فِيهَا فَأَنْزَلَ اللَّهُ {لَيْسَ عَلَيْكُمْ جُنَاحٌ} فِي مَوَاسِمِ الْحَجِّ قَرَأَ ابْنُ عَبَّاسٍ كَذَا