SASHELP.CLASS looks like demographics to me. I often use it

Jack Shostak's book has clinical data and you get it from the web. It is easy to use as CARDS data. You may want to buy his book, not sure about the legal aspects.

But for your purpose I think you should have a program that generates clinical data. You can start simple with DM and AE then branch out to the other domains. Make it all CDISC "compliant" of course. It is not too difficult using procs PLAN and SURVEYSELECT, and various random number generators. From that you can easily make more treatments or more subjects as needed to illustrate the various features of your programs that you want to call attention to.