Good Tea Presentation/Dimenstration Topics?

Last year for National Library Week I gave a presentation at the library where I work on tea. As we had never done anything like that, it was a bit catch-all with a little on history, general knowledge on tea types and preparation, culture, and then provided some sampling. I had a much larger turnout that I had anticipated, which put a bit of strain on me when it came to the sampling, since I was working with all my own supplies in a library program room, heh. The good news is at least it was popular and well-received?

So now it is just about a year later (National Library Week is next week!) and our HR supervisor stopped by and told me that she was at one of the craft programs the other night and two of the patrons attending told her, “That tea program the library had was so good. Are you ever doing another one?” While I am mildly flattered they still remembered it a year later and want to see it return, I do know in hindsight I would need at the very least some sort of a sign-up sheet so I know exactly how many people to expect/prepare for, and I’d also hate to do a carbon-copy presentation of before (also, the Great Server Crash of 2018 last year meant I also completely lost that presentation so I’d have to start from scratch anyway). So, my tea friends, what are your thoughts on what would make some fun topics/ideas for tea presentations or dimenstrations that could logistically be given in 1-2 hours to a smallish group in a public library program room setting? Just looking for some brain-storming before I decide if I want to hold another program!