The new version 1.71 includes a new Screen that let guests input their names and find their tables. When they tap on their names, a picture of the layout will give them a visual reference of the place. 

This window will not have a close button -you will have to tap myBanquet's logo twice to close the window- to try to stop Guests from playing Angry Birds. However, we cannot block the iPad's multitasking or Home button.