I had the pleasure of speaking at DataEngConf this year in San Francisco. If you haven't heard of DataEngConf, I highly recommend attending.
The conference organizers really ensure that the conference is for developers first and foremost and that the content focuses on deeply technical topics.
All the videos from DataEngConf 2018 can be found here: https://www.youtube.com/user/g33ktalktv/playlists
My talk gives an overview of In-Memory Data Grid architectures and dives a bit into Apache Geode specific concepts.
Video of my talk, "What the Heck Is An In-Memory Data Grid", is below.