They are all foreign ministers who can speak English, better if they speak English so that Muslim across Muslim world can relate to this meeting. Better use English to unite Muslim world more.
I see 25 Muslim nations (foreign ministers)
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English, French, Arabic are all major international languages the UN has experience cross translating. The OIC should hire interpreters so that foreign ministers can speak in whichever language helps them best convey their message and their message is simultaneously translated to a number of languages, so as to reach as many people as possible.
languages spoken by tens if not hundreds of millions of Muslims should also be planned for; such as Bengali, Urdu, Turkish, Malay, and Bahasa (Indonesian)