I think OP doesn't want to look corporate? That's my feeling from the dresses she has posted so far... None of them are what I would find appropriate to wear to lunch/ to present.
It's hard to say isn't it without knowing exactly what the event is, I would wear pencil skirt, blouse, heels but OP doesn't want to look overdressed, either
What do I know, I just read a thread the other day saying Eastern Europeans have terrible dress sense, so maybe I should not be in Style & Beauty 