I'd like a foraging show as well.
Specifically:
Why Forage? Somethings you can't or wouldn't want to cultivate on your land. Collecting seed from non-commercialized plants etc.
Where to forage (public, semi-public and private lands). Perhaps resources like
https://fallingfruit.org/The ethics and legality of foraging (regarding overharvesting, "invasives", and just decent practices like carry-in/carry-out policies)
The logic behind searching for a specific item. For example, berries are eaten by birds who roost in trees along the edge of a forest, so seed dispersion is greatest there for berries. Non-fruit seeds will be spread by wind and water, directing your search to those areas, etc.
Putting together a toolkit for foraging. Shears, gloves, a lighter, containers, a hand trowel, a smartphone (GPS plus identification guides) etc.
I was actually doing a write up for this on the forums, but lost it in a browser crash. Without getting into strategies for harvesting specific items, it could be difficult to do a full length show on just the basics. Most of the information is species specific, much like hunting. However, this would go well with a recap of Guerilla Gardening, as there's a lot of overlap in the practices.
There is still a significant number of people here who are interested in acquiring fruits, nuts and herbs, but have no land to cultivate them. These are the people who are always complaining about the permaculture shows. It's not that they object to the subject matter as much as they have no means of employing the knowledge they acquire in a small apartment. I think foraging could help them bridge the gap between knowledge and experience. It would be something "new" to a lot of listeners, but still have a wide appeal as anyone can practice it.