How do I get to Wuzhen Watertown from Lanxi Zhejiang ? Trip is mid-Dec.

I think you may mean the Zhuge Baguacun in Lanxi City, right?
If so, it is an interesting ancient village. The structure of the village is related with the Chinese Ba Gua, which make the small village mysterious. Maybe you can have a visit there.
To reach Wuzhen, you need to go back to Hangzhou first. From Lanxi, you can take the direct buses to reach HZ South Bus Station. Get out of the bus station, you can walk to Wujiang Road Station to take subway line 1 to reach Keyun Zhongxin Station (General Central Bus Station). From this bus station, you can find the direct buses for Wuzhen Watertown.
Hope these information can help you.