@Talmage, there are a bunch of great self defense with a cane videos on Youtube.
The USCCA doesn’t have any specific cane defense videos, but Kevin Michalowski did an Into the Fray that does address this type of situation:
Also, you may want to check out videos about defense from a seated position - if you’re out in a restaurant, you’re probably going to have a harder time standing up/fleeing if you’ve got a cane. That’s definitely something that will come into consideration.
Here’s a thread that addresses shooting from a seated position: