How to set up a surprise anniversary dinner for my girlfriend?

First, you'll need to figure out what your girlfriend's favorite food is. You can ask her directly, or try to clandestinely find out from her friends or family. Once you know what she likes, you can begin planning the rest of the meal. For a romantic dinner, you'll want to set the mood with candles, soft music, and maybe some flowers. The food should be something special that you don't usually make at home. If you're not a confident cook, you can always order from a nice restaurant. The most important part of any surprise is the element of surprise, so whatever you do, make sure she doesn't find out beforehand!