In case of an event, if the recipient of service is registered, the place of supply of services for organizing the event shall be the location of such person. However, if the recipient is not registered, the place of supply shall be the place where event is held. Since the event is being held in multiple states and a consolidated amount is charges for such services, the place of supply shall be taken as being in each state in proportion to the value of services so provided in each state. (The Explanation clause to section 6(8) of the IGST Act)