Ibn Umar (Allah be pleased withthem) reported Allah's Apostle ﷺ having said this: When any one of you is invited to a wedding feast, he should accept that.

حَدَّثَنَا ابْنُ نُمَيْرٍ، حَدَّثَنَا عُبَيْدُ اللَّهِ، عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ، أَنَّ النَّبِيَّ ﷺ قَالَ
" إِذَا دُعِيَ أَحَدُكُمْ إِلَى وَلِيمَةِ عُرْسٍ فَلْيُجِبْ " .