At the same time as Drupalcon Denver there will be an event about 15 minutes walk away called SnowFROC which is the Front Range OWASP Conference. OWASP being the Open Web and Application Security Project.
Historically this event has been pretty huge drawing in famous speakers delivering presentations they go on to deliver again at Defcon or Blackhat.
They are currently looking for submissions of papers. Registration is also open.
It will be a tough call to decide between the events, but if you see a few talks at SnowFROC you want to see it's only 15 minutes to walk over there from the Drupalcon venue so you can go back and forth and at $20 it's easy to register for part of the day and still get your money's worth.
