Lodging in Aspen is more affordable than you might think.  There are great off season and event related specials to be found during the John Denver Celebration.
Here are few hotels of the lodging  of the John Denver Celebration attendees with many more wonderful accommodations throughout Aspen!

The Mountain Chalet

St. Moritz

The Limelight Hotel

St. Regis

Other Accommodations

You can check on line or contact the following:  

Aspen Chamber Resort Association