Fuck Weight Watchers.

Hello guys, i need some advice:
Our school is having a "auto-management" (idk how to translate) period, it lasts 3 or 4 days just before christmas vacation, and in those days students get to organize courses about pretty much everything to teach stuff to other students (exept stuff like video games cuz the principal is closed-minded), some friends asked me to make a course about programming in c# because they are interested, i thought it was cool so i said OK.
Now i'm thinking how to structure it, it's going to be 2 "lessons" of 2 hours each, and it's open to everyone in the school.
I don't want to do a full blown course explaining everything, i just want to give them a kick start and point them to the right direction, I thought about explaining some "theory" in the first lesson, I'm assuming almost everyone that will come never did programming stuff, so i'm thinking of explaining stuff like how a computer works, why you need a compiler, etc.. maybe based on the introduction from learncpp.com without getting to much into the details and then explaining how c# works and its grammar.
Then in the second lesson i'll try to code togheter some stuff (We'll have just one pc attached to a projector).
So, how would you do this ? I mean i never tried explaining programming to someone else and i'm self-taught i looked at the guide on msdn but it starts directly by giving you an hello world, should i follow it ? I fear i'd get too thecnical and they wouldn't understand me, do you know some good guide i can use as a reference ?
ps: there's going to be max 30 people