Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
bukhari:5179ʿAlī b. ʿAbdullāh b. Ibrāhīm > al-Ḥajjāj b. Muḥammad > Ibn Jurayj > Mūsá b. ʿUqbah > Nāfiʿ > ʿAbdullāh b. ʿUmar

ʿAbdullah bin ʿUmar said, "Messenger of Allah ﷺ said, 'Accept the marriage invitation if you are invited to it.' " Ibn ʿUmar used to accept the invitation whether to a wedding banquet or to any other party, even when he was fasting.  

البخاري:٥١٧٩حَدَّثَنَا عَلِيُّ بْنُ عَبْدِ اللَّهِ بْنِ إِبْرَاهِيمَ حَدَّثَنَا الْحَجَّاجُ بْنُ مُحَمَّدٍ قَالَ قَالَ ابْنُ جُرَيْجٍ أَخْبَرَنِي مُوسَى بْنُ عُقْبَةَ عَنْ نَافِعٍ قَالَ سَمِعْتُ عَبْدَ اللَّهِ بْنَ عُمَرَ ؓ يَقُولُ

قَالَ رَسُولُ اللَّهِ ﷺ أَجِيبُوا هَذِهِ الدَّعْوَةَ إِذَا دُعِيتُمْ لَهَا قَالَ كَانَ عَبْدُ اللَّهِ يَأْتِي الدَّعْوَةَ فِي الْعُرْسِ وَغَيْرِ الْعُرْسِ وَهْوَ صَائِمٌ  


See similar narrations below:

Collected by Muslim, Dārimī
muslim:1429hHārūn b. ʿAbdullāh > Ḥajjāj b. Muḥammad > Ibn Jurayj > Mūsá b. ʿUqbah > Nāfiʿ > ʿAbdullāh b. ʿUmar

I heard Abdullah b. Umar (Allah be pleased with them) narrating that Messenger of Allah ﷺ said: Accept the feast when you are invited to it. And Abdullah (b. Umar) used to come to the feast, whether it was a wedding feast or other than that, and he would come there even in the state of fasting.  

مسلم:١٤٢٩hوَحَدَّثَنِي هَارُونُ بْنُ عَبْدِ اللَّهِ حَدَّثَنَا حَجَّاجُ بْنُ مُحَمَّدٍ عَنِ ابْنِ جُرَيْجٍ أَخْبَرَنِي مُوسَى بْنُ عُقْبَةَ عَنْ نَافِعٍ قَالَ سَمِعْتُ عَبْدَ اللَّهِ بْنَ عُمَرَ يَقُولُ

قَالَ رَسُولُ اللَّهِ ﷺ أَجِيبُوا هَذِهِ الدَّعْوَةَ إِذَا دُعِيتُمْ لَهَا قَالَ وَكَانَ عَبْدُ اللَّهِ بْنُ عُمَرَ يَأْتِي الدَّعْوَةَ فِي الْعُرْسِ وَغَيْرِ الْعُرْسِ وَيَأْتِيهَا وَهُوَ صَائِمٌ  

darimi:2127al-Ḥakam b. al-Mubārak > ʿAbd al-ʿAzīz b. Muḥammad > Mūsá b. ʿUqbah > Nāfiʿ > Ibn ʿUmar

[Machine] The Messenger of Allah ﷺ said, "Respond to the caller when you are invited." He said, "And Abdullah used to attend invitations, whether they were wedding celebrations or not, even while fasting."  

الدارمي:٢١٢٧أَخْبَرَنَا الْحَكَمُ بْنُ الْمُبَارَكِ حَدَّثَنَا عَبْدُ الْعَزِيزِ بْنُ مُحَمَّدٍ عَنْ مُوسَى بْنِ عُقْبَةَ عَنْ نَافِعٍ عَنْ ابْنِ عُمَرَ

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ «أَجِيبُوا الدَّاعِيَ إِذَا دُعِيتُمْ» قَالَ وَكَانَ عَبْدُ اللَّهِ يَأْتِي الدَّعْوَةَ فِي الْعُرْسِ وَفِي غَيْرِ الْعُرْسِ وَيَأْتِيهَا وَهُوَ صَائِمٌ