Please consult your own country's guidance as regards your entry requirements into the Japan in order to attend IRG56.
Here is the link that provide some guidance. Seek out further information that is most pertinent to your particular situation or needs, depending on your country of origin and/or current location. More information can be obtained through comprehensive internet searches.
Japan's tax-free system is scheduled to gradually transition to a new system starting in April 2025.
Please check the latest information individually from Here.