Help! Reunion Wardrobe

My ten year high school reunion is exactly one month away, and I could not be less excited. I'm not looking forward to it in the least, but am afraid if I don't go, I will regret it. So....my lovely friends have pushed me to get with it and find something to wear. Since I'm dreading this event so much, I've put it off and haven't really been in the "finding" mood.

While at the Old Navy last weekend, I commented on a maxi dress in a fun print. They made me try it on, and they made me buy it. I'm still not sold on it.

And this is where you all come in. Please give me your opinion. I'm not sure the fit is correct. I feel like it would be better suited for a beach party than a school reunion. But my friends love it.  I have on an orange multi-strand necklace (hard to tell in this photo) that I would wear with it.

So honest opinion. Keep looking?