Oracle Hospitality OPERA Sales and Event Management (OSEM) is an extensive sales and catering management application that seamlessly integrates with Oracle Hospitality OPERA Cloud Service products for streamlined operations and maximized revenue. With the advantages of the cloud, you can take our event management system mobile for offsite customer visits or roam the property with customers during site inspections, check availability of inventory, and make changes to the customer’s bookings while on the go.