CC Ādi 17.133
sandhyā-kāle kara sabhe nagara-maṇḍana
“In the evening I shall perform saṅkīrtana in each and every town. Therefore you should all decorate the city in the evening.
At that time, Navadvīpa was composed of nine small cities, so the words nagare nagare are significant. Śrī Caitanya Mahāprabhu wanted to perform kīrtana in each of these neighboring towns. He ordered the city decorated for the function.