Most of the invoicing for products and services is performed through our on-line order system previously detailed. However, orders are sometimes placed at show site during move-in or on the first day of the show. These additional products or services are billed at the event by our on-site customer service representative. Other items that may be billed during an event are those that are discovered during the booth check process. These are products and/or services that were not ordered by the exhibitor or show manager, but are being utilized at show site.