Local foraging: edible and medicinal flora native to the area, along with which plants to avoid. And perhaps less practical, but I'm partial to local wildlife identification because it's fun :D
Someone else already mentioned comms, and I just want to add that this is a very valuable thing. Building a network of trustworthy people in your community and teaching them how to program and use radios would be absolutely life saving in emergency/disastrous situations. Maybe it's the prepper in me, but it's good to prepare for the worst and hope for the best with the current climate.
I'd say a series of basic survival courses that could be broken down by topic:
- First aid/CPR
- How to start a fire without a lighter
- Building shelter
- Wilderness survival
- Methods for obtaining potable water