Most Helpful Girl
I would say a one shoulder somewhat fitted dress would be perfect for the event. Or if one shoulder dresses aren't your thing, a three quarter sleeve dress with a high neckline and scooped back would be gorgeous.
I'm on my iPod right now so I can't post a link, but I know forever 21, delias, and express will all have a great selection.
Just keep in mind when you're choosing a dress that it should be classy and professional, but still flattering. You don't want your boss to think he hired an old grandma :)
Hope this helped!