I've just seen an announcement on twitter that Prof Bill Sherman will be giving a talk on The History of the Book and The History of Cryptography online on 04 June 2020 at 13:00 BST (GMT+1). If you wish to attend the online talk then you need to book in advance, presumably so you can be sent a link to the web-stream.
The talk is being organised by The Book and Print Initiative which is a project within the Warburg Institute/School of Advanced Study/University of London.
The only thing I have right now (1st June 2020 at 12:30 BST) is a link to the tweet annoucing the event You are not allowed to view links.
Register or
Login to view. as the Warburg Institute's website is currently broken which means that the booking link and any additional information is inaccessible. So far, I have not been able to sign-up for the talk.
Disclaimer: I don't know Bill Sherman and have no links to any of the groups organising this event, I just saw it on Twitter and thought it looked interesting!