You can find some past keynote recordings in YouTube. The last one requires a direct link, the others are publicly available at IEEE NorCAS YouTube channel.
Direct links to the videos:
Nele Mentens: Cybersecurity in Flexible Electronics
Marja Matinmikko-Blue: 6G Driving Sustainable Development
Darshika G. Perera: Reconfigurable Hardware Architectures for Edge Computing
Mohammed Ismail: Compact RF CMOS Radios for Emerging 5G/6G Wireless
Tim Constandinou: Future Human: Merging Minds and Machines