The shared practice room

An original notice containing five intentional errors.

The room are familiar to anyone who attended the previous workshop, but its furniture has been moved. Guest's should contacts the orginiser before arrival if they need infromation about the new arrangement. A short explanation will also be provided at the door. Please do not assume that a chair has been removed permanently because it is absent from the first layout you see. Some furniture remains in storage.

Proofread the notice. Identify the five errors and write the correct forms. You do not need to rewrite the whole passage.