Honor society...need to look very well mannered???

its an 8th grade award ceremony....its all about the grades and honor roll and behavior...(not a graduation)....not very very fancy...but kinda formal...is this dress good enough what necklace should i wear and what shoes....i need details...if it isn't good please suggest thnx...a href="http://www.charlotterusse.com/product/index.jsp?productId=3037613&cp=2843536.2744997&view=all&clickid=cat_leftnav_txt&parentPage=family" rel="nofollow"http://www.charlotterusse.com/product/in…/a