In the past I’ve often demonstrated concepts to clients using their own data, recently I have been working on a dataset using my own data so the I can share demonstration and training videos and other materials more readily.
My first effort was a training video for pivot tables, although it ended up being more about how to import CSV data into Excel!
The current state of the data is here in a Access Database BellAndWhistleV1.2
This data is supplied free and with no guarantee, download it, use it, attribute if appropriate.