Same day demo, retrospective and planning

We have our demo, retrospective and iteration planning on the same day (wednesday). The problem with that is that if we wait to press the accept button until after the demo, those stories become late and part of the new iteration which messes up our velocity.

A couple solutions that came to mind were to be able to set the time which the new iteration starts to a sat 2pm on iteration day that way the demo can be done in the morning and all stories are accepted before the new iteration starts.

Another solution would be to have an accept and demoed button where the accept marks the story as done as far as velocity calculations go.

Another way would be to set the iteration on Tracker to a day after our actual physical meetings but that would bastardize the tool.