If you are going to the 13th Conference on Retroviruses and Opportunistic Infections, check the deadlines immediately at www.retroconference.org/ (click CROI Schedule and Timelines).
October 26: Community Educator application deadline.
October 26: International Scholarship application deadline.
November 25: Community Press application deadline.
November 30: Preferential registration/housing deadline for authors, faculty.
December 1: General registration opens for researchers and clinicians (the conference usually fills up and turns people away, so it is important to register early).
January 2: Late-breaker abstract submission deadline (the main abstract submission deadline was October 14).
January 5: Deadline for "consumer press" applications (mainstream press, not AIDS press).
January 5: Registration and housing closes (unless it already closed due to limit of 3,800 registrations).
But check the site for confirmation, and for other dates.