Having spoken at a local conference [https://blog.jonsdocs.org.uk/2020/01/31/towards-a-safe-and-secure-smart-world-conference/], local meetup [https://blog.jonsdocs.org.uk/2019/10/19/codeharbour-dev-for-africa/] and given a number of guest lectures at universities and schools I've had good and bad experiences working with inviting organisations.  This

Advice on public speaking, based on my experiences so far.