Need to sort blogpost other than publish/created/modified date

Hi,

Is there any idea/trick how I can sort blogposts other than publish/created/modified date? I have a event category, and I would like to display those posts by the event date. I know its not possible to sort by the custom field. Is there any other idea how to achieve this?
I can manipulate the publish/create date, but so far I understand if I set the date of this fields to the future it will not appear..
At the end I would like to have an event calendar with my blog...

Any idea/suggestion?

Klaus