02 July 2018
The place of supply of services for conferences is specified as place where the event is held Section 12(7) of the IGST Act. Presuming that none of your directors are registered under GST the location of supplier as per the Act would be the usual place of residence of the Director. Hence if the usual place of residence of the Director is Kolkata CGST/SGST would be charged and if otherwise IGST would be charged.