They had a family feast to celebrate it.

他们举办家宴，以示庆贺。

《新英汉大辞典》

Family feast is an important tradition during Thanksgiving.

家庭盛宴是感恩节期间的一个重要习俗。

youdao

Before dawn, the wife went downstairs to prepare the family feast.

在黎明前，妻子下楼去准备家里的酒席。

youdao

These offerings are generally consumed by the offerer and his family, very often in a festive situation, as a big feast, after certain portions are donated to the priests, again.

这些祭品通常由供奉者及其家庭自己消耗掉，通常在节日，把某些部位先给祭司后，它被作为大餐被全家享用。

耶鲁公开课 - 旧约导论课程节选

Nasir shared his wedding feast with the grieving family.

NEWYORKER: After America

Women will spend all day cooking the favourite food of the dead relative for the customary feast, in which friends and family gather to toast the ghostly visitors.

BBC: Mexico's Day of the Dead

"New and creative ways to investigate and share history, culture and tradition have combined within a family friendly and inclusive focus to evolve this traditional feast day into a civic celebration belonging to all the people of Omagh and further a field, " it added.

BBC: St Patrick's Day parade in Omagh