As already stated, the main thing that I would focus on is mindset and preparation, as they are two of the biggest factors in avoiding an incident. Also, I would gear my presentation with slightly different emphases depending on the gender bias and ages of the group.
- Situational awareness - Google the address ahead of time for meeting invites, see the area, look at lighting if at night, typical clientele, number of exits, proximity to other open businesses, things of this nature.
- Walk/Attitude - head up, looking around, confident will deter many casual thieves, but huddled, tentative can attract
- Let others know - When you are going, how long you plan on being there, leaving, availability. This is typically more for women than men, esp on tinder dates or similar, but applicable for everyone.
These are all approach and mindset, then I will go into the physical portion of it. Typically I will teach basic weak link releases and grab defenses (they grab the pony tail/hair, etc), and some of the most basic places to strike to distract or try to weaken grips. Soft on hard, hard on soft, how to punch, how NOT to stick your keys in your fingers (I get that in about 60% of my classes, the "I heard that") so that they have an idea of what to do.
My closing spiel consists of "go DO what you learned", take more courses, practice practice practice. Mom, dad, partner, friend, whatever. Practice, hit a heavy bag so you know what it feels like, and so on. But the biggest emphasis is on mindset/attitude and situational awareness/approach.