Stop by Suleymaniye Cultural Information Heart. This Centre is undoubtedly an NGO managed by volunteers who also operate inside the Suleymaniye Mosque. They give free details about Islam as well as Islamic society each inside the mosque and in their Centre. They've got an interesting presentation about Islam and mosques. https://fernandobnyku.tdlwiki.com/1669186/5_essential_elements_for_istanbul_wordpress