Radio Frequency Identification (RFID) technology is considered to be the next step in the revolution of supplychain management, retail, and beyond. To derive real benefit from RFID, the applications must incorporate functions to process the enormous event data generated quickly by RFID operations. For this reason, many RFID middleware systems have been developed. Although RFID middleware assists in the management of the flow of event data, developers require real time knowledge of meaningful events, which are more actionable not simple data collection. Determining meaningful events requires a context, which typically comes from reference data. In this paper, we present a contextual event framework (CEF) that transforms RFID events into contextual events