Posting in Advance

Hello everyone,
Let’s see if we can solve this one. I want to be able to make posts in advance. The blog needs to indicate upcoming events on the calendar. When I post a message and change the time stamp to something in october, the calendar gets the little OCT at the bottom, but when you click on it you get a blank calendar and nothing found.
Is there a plugin, hack, something that will allow me to show events in the future now?
Kind regards,
Gravity