Whom does Aslan awake to call the stars home

Aslan awaked a great giant whose name was Father Time. He would wake on the days the world ended.  This creature raised a horn to make a sound to call all the stars falling.

Whom is Peter surprised to meet in Aslan’s country? 

They met a young Calormene and his name was Emeth. He was that person who volunteered to enter the stable to see the Tash.  Now he was sitting under a chestnut tree beside a clear stream of water

Whom does Aslan command to shut the door?   

Aslan commanded Peter (High King of Narnia) to shut the door.