[Machine] It is said that "Ma'roof" refers to something that is praised or considered good. It is said that Zuhayr ibn Uthman reported that the Prophet ﷺ said, "The wedding feast is a right, the second day is 'ma'roof', and the third day is a fame and showoff."  

يُقَالُ لَهُ مَعْرُوفٌ أَيْ يُثْنَى عَلَيْهِ خَيْرًا يُقَالُ لَهُ زُهَيْرُ بْنُ عُثْمَانَ أَنَّ النَّبِيَّ ﷺ قَالَ الْوَلِيمَةُ حَقٌّ وَالْيَوْمُ الثَّانِي مَعْرُوفٌ وَالْيَوْمُ الثَّالِثُ سُمْعَةٌ وَرِيَاءٌ  

that the Messenger of Allah said: 'The wedding feast on the first day is an obligation, on the second day is a custom and on the third day is showing off.” (Using translation from Ibn Mājah 1915)   

أَنَّ رَسُولَ اللهِ ﷺ قَالَ الْوَلِيمَةُ أَوَّلَ يَوْمٍ حَقٌّ وَالثَّانِي مَعْرُوفٌ وَالْيَوْمَ الثَّالِثَ سُمْعَةٌ وَرِيَاءٌ