笙歌放散纵有笙歌
[shēng gē fàng sàn zòng yŏu shēng gē]
Even amidst lively music ('Sheng Song', referring to traditional instruments like sheng (reed pipe) and songs) and revelry, there's dispersion. Implies enjoying celebrations now even when knowing that all good things must end eventually. Celebrations are momentary, and so is merriment, reflecting the transience of happiness.