Ah, the million dollar question.  While we can't pick your outfit for you (a reunion committee can only do so much), we can give you a little guidance in this department. 

The suggested attire for Friday Night Cocktails is Casual.  For the Saturday Night Main Event, Dressy Casual.  "What exactly does that mean?" you ask.  Keep reading for some handy info stolen from another website:

(Feel free to gussy your little selves up, however.  I am dressing up way more than "dress casual."  More like "Vanna White"--overly dressy for the occasion--just for fun. --Ali)

How should I dress for my reunion?

Our vote is a toga. Of course, your reunion committee probably feels otherwise. The first thing to do is to look on your reunion announcement and see what type of dress has been suggested. The most common terms are semiformal, cocktail attire, dressy casual, business casual, or casual. And, with thanks to the Rocky Mountain News' Style Matters columnists Judie Schwartz and Evelinda Urman, these are defined as follows:

• Semiformal: Men wear dark business suits, women wear fancy cocktail suits, short gowns and dresses.
• Cocktail Attire: Men wear dark suits, women wear cocktail suits or the proverbial "little black dress." Cocktail attire is dressier than career wear, but a bit less dressy than semiformal. A cocktail dress is a short elegant evening dress made of luxury fabrics. Length is anything but formal (meaning not to the ground).
• Dressy Casual: Office parties held at the boss's home often call for dressy casual. Note that casual does NOT mean jeans, flannel shirts or work boots, all common misinterpretations of this category. Men should wear sport coats and women should wear slacks suits, or long or short skirts with nice tops.
• Business Casual: Slightly less dressy than dressy casual, think conservative office Friday apparel. Khakis, polo shirts, slacks, short skirts would all work.
• Casual: What you'd wear to the grocery store. It's party time, people!

There is always a wide range of clothing worn to reunions. The most important thing is to be dressed "nice and comfortable." No one will kick you out for wearing tennis shoes! (The toga may be another story...)