It should be clear that if Quran Khwani is performed as tradition, show off, Sunnah or something necessary before marriage occasions then it is not correct. However, it is to some extent permissible if it is seldom organized to seek blessings
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References:
القرآن الکریم: (الاسراء، الآیۃ: 82)
وَنُنَزِّلُ مِنَ الْقُرْآنِ مَا هُوَ شِفَاءٌ وَرَحْمَةٌ لِّلْمُؤْمِنِينَ ۙ وَلَا يَزِيدُ الظَّالِمِينَ إِلَّا خَسَارًاo
Allah Knows Best
Darulifta Al-Ikhlas,Karachi