This story may have more legs than what we originally thought. The LA Times had an article reporting that the Obama campaign may limit the convention to 3 nights. Now a tip from Marc Ambinder and a little digging in the DemConWatch archives leads to the possibility of holding the 4th night at Invesco Field at Mile High. Invesco is just across I-25 from the Pepsi Center and is within walking distance.
Barack Obama's campaign and the Democratic National Committee are toying with a convention scheduling change that has been broached before in theory but never seriously considered: cutting the party's conclave in Denver short by one day to give Obama an extra day of post-nomination bounce in the crowded August calendar.
For the last several decades -- when conventions became forums that merely rubber-stamp a presumptive nominee -- they have traditionally run from Monday through Thursday. Increasingly, both parties have struggled to offer something of interest during the first couple of convention nights, and the television networks have responded by dramatically reducing live coverage. The only truly significant event has been the nominee's acceptance speech, delivered during prime time on Thursday evening.
But Obama aides have floated the idea of ending the Denver convention on Wednesday, Aug. 27, instead of Thursday, Aug. 28. - LA Times
Hick says no, but that was in response to the question of will the convention only be three days. But the forth day at Mile High? (sorry I can't call it its real name) A rock concert send off for the rock start candidate?
Update - More on the Mile High possibilities at DemConWatch.