First start with the name of the fair. Then describe it in short.
Then go in the dept and describe it more and then conclude.
Books are the true friends.They are with us in our sorrows and joys.Good books have changed the lives  of many people and  become the cause for their success.However,we cannot buy all the  a book fair serves this very purpose.A visit to a book fair regularly is no doubt a brilliant idea.We can avail the opportunity of going through various books for all ages and authors iat one place.One should get into the habit of visiting a book fair which brings an immense benefits to the readers. 
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u r talking as though as no one has ever used copied very mean u know!!