The school book sale

The notice below contains four errors: one in grammar, one in punctuation and two in spelling.

The book sale begin at ten o'clock on Saturday. Childrens books will be arranged on the front tables, with all other titles in a seperate section. Please check that each donated book is clearly labeld with its price before the doors open.

Proofread this notice by finding each error and giving its correct form. You do not need to copy out the complete notice.