Preparations for a Workshop

To use the language of The Good, the Bad and the Ugly:  There are two kinds of Photo Clubs, those who dictates what type of photos to shoot and those who share their knowledge and listens to all the members.
 
I am lucky to be a member of the second type.  In order to contribute with my share of knowledge I made some preparations for a workshop on Focus Stacking to be held on Sunday. By doing so, I actually learned a lot myself.
 
Btw.  In my remote part of the world, we call our communities Photo Clubs.  On our meetings we discuss photos and photography.  I am a bit curious what you discuss in a Camera Club.  New models of cameras and lenses you didn’t know you needed?  OK, OK - apologies for this rude question. :-)