There’s a sort of online virtual version of the cancelled Vintage Computer Festival Pacific Northwest 2020 show organised by @mbbrutman - see
RetroFair2020
and the linked playlist, where various would-be exhibitors have videoed a show-and-tell of what they would have brought to the show:
https://www.youtube.com/playlist?list=PLpKSFwrlcf8bPwLVgDQ5HLFrQHQftpaNs
via the Floppy Days podcast currently covering BBC Micro history but as always with quite diverse show notes.