annual instructional meetings

[Nevadaref]

For those of you who are a part of planning or giving the instructional clinics for your associations, what are some good topics that have held the interest of your group, both the new and the experienced officials?
I have thought of two:
1. How a quarter ends.
2. Delay of game situations (warnings/resuming-play/T)
But would like some more ideas. Thanks.