I was very happy that I had a good deal of French. I learned it at school and I also speak it from time to time because I live close to the border. However, while I found that I usually understood what was being said, I discovered that speaking was another matter. So I listened to talks in French and used English for my questions and remarks.
I presented two talks in English, Little Gems in TYPO3 v12 and How to create partially automated project documentation with phpDocumentor, which were both well received.