Since they treated us to dinner, out of reciprocity we should host next time.
Tips
history
From 《礼记·曲礼上》: '礼尚往来。往而不来,非礼也;来而不往,亦非礼也。' — the Book of Rites states that going without return is impolite, and receiving without return is equally impolite.
culture
Central to Chinese social etiquette (人情). Extends beyond gifts to favors, invitations, and even retaliation — 'they hit us, we hit back, 礼尚往来' is used ironically for tit-for-tat.