 BOSTON--BUSINESS WIRE--Advent Technologies Holdings, Inc. NASDAQ: ADN Advent today announced that Advent Chairman and CEO Dr. Vasilis Gregoriou will speak at the Edison Open House: Transport Futures event on Wednesday, June 16, 2021. The three-day digital investors event is produced in partnership with the London Stock Exchange, OTC Markets Group, and Influence emobility. The event will feature top, publicly listed companies that are shaping the future of transport. Dr. Gregoriou will d 