I am looking for ideas to make up for forgeting my girlfiends B day?

I forgot that we were supposed to have plans to celebrate her birthday one day before her birthday because for a friend of hers was coming into town that day and I had to work. Also we had a family member fly into town a few days later so the week was pretty chaotic. We wouldn't get much time to spend together that week because of all the plans they were making. So in short in the stress to remember everything I forgot to make plans for us to celebrate her birthday. The whole week i haven't had a chance to make it up to her and she is extremly upset about it and I need a way to make it up, but lately I have hit a dead end in ideas. So any help or ideas would be greatly appreciated.