If you are bringing wine into the U.S. , there is really no limit on quantity, as long as you can claim it is for personal use or educational use, NOT RESALE. Just say that “this wine is for a winemaker training session that I am going to do at VitiNord.”
We have written an official letter signed by the VitiNord conference chairperson, Terry Bradshaw, that explains how your wine will be used for educational purposes at VitiNord. The letter includes the conference website link if the Customs officer wants to check it out.
Please download and print out a copy of this letter and put it in your box of wine so the Customs inspector sees it when he or she opens the box.