How to prepare a good training for SSAS if you aren’t a trainer!!
I think the key is the student, collect the needs and start from there. You could pass all the session to explain something they don't need for them, you will find this very hard to motive them.
You could also ask to the base of BI and see what the knowledge of your attended is. The tool of SSAS is very complex and you need to have some requirement before, for example, you need to have some skill about Visual Studio.
I like share my knowledge and I will try to be prepared for the next time!!