On the Symfony blog they talk about the SunshinePHP Conference (happening in Miami, February 8th and 9th) and it's dedicated Symfony track.

The SunshinePHP conference will take place in M-I-A-M-I, what a cool place for a Symfony conference during cold winter time! Save the date, on February 8th & 9th, you can register for two days of Symfony sessions, making this the first Symfony event on the east coast of the USA. The Call for Papers is still open, so do not hesitate to submit a talk about Symfony.

The conference isn't just limited to Symfony sessions either - you can submit on whatever web or PHP-related topics you might like to present. Hurry though, because the Call for Papers ends in less than a week (on December 1st)! For more information about the event or to get your Early Bird tickets (just $159 USD) head over to the main conference site.