Willy Wonka Wedding Weekend

This weekend was a very unique wedding.   I bartended a Willy Wonka themed wedding that was really cool, colorful, and had some of the most warm hearted people I have ever met. I brought in my full bar set up.    Cocktails were themed and enjoyed by all.  It was a long drive to Escondido so I made the weekend out of it.  Visited local areas and enjoyed some R&R.

Some business lessons.  Estimating the amount of supplies needed is really hit and miss. It seems my estimates are high resulting in extra bottles and mixers.   I would like to get a better estimation going but cant seem to find much information on it from other bartenders in the business posted on the web.   Bevmo, wedding sights, books, all have differing methods of estimation, but they seem to mostly focus on the alcohol portion and not much on mixers, garnishes etc.   

Anyone have suggestions on better and more closely estimate the shopping list?

Any help is much appreciated.