I only read some portion of the summary. It is difficult to access the whole book online unless you want to buy it. My answer is an assumption based on the summary I read.
The news of the emissary's impending visit affected the village. Every potter there is working to create their best work and present it to the emissary. Min, the best potter but also the slowest due to his perfectionism, has not been able to present his works. Thus, Tree-Ear offered to bring the finished products to the palace so that the King will be able to scrutinize Mins' masterpieces.
