No wonder that day when Lian Xiuxiu was married off, they even brought Lady Zhou and Lian Lanlan with them; this had been planned in advance to keep Lady Zhou and Lian Lanlan from talking.
On that day, they were supposed to stay in Lian Xiuxiu's bridal chamber all the time, and they certainly did not go to witness the wedding ceremony. Even if they could leave the room, they could probably not leave the designated courtyard.
But there were still those from the Zheng Family attending to them, couldn't they have said something? In the course of conversation, the fact that Third Old Master Zheng was the groom should have been revealed somehow.
Unless, the Zheng Family was also complicit. On the Zheng Family's territory, it would not be difficult to keep these few women trapped and deceived just for that half day.