Tomorrow at the SkyClub will be fine. Don't be surprised if the agent offers to comp you to Delta elite and also tries to sign you up for a SkyClub membership and waives the $50 enrollment fee. You'll actually have access to that lounge with a PC membership through January 2010.

The only other option for a lounge that CO PC members would have in the future would be the RCC there. I don't know the layout well enough to know if that is viable but it should become accessible from a credentials perspective at the end of the month.