I will hate to miss having dinner with friends, but since the time cannot be moved back, I think that I will be better off just having a pickup from a hotel in Crystal City at 8PM and room servicing.
I will just be coming off CDG-PHL-SDF-DCA within 36 hours including a full day's work in Louisville and another staring me in the face in Fairfax County, then back to LGA. Hustling to a DCA rental car and then only having a short time with the dinner party will so detract from the visit that it will be better not to try.
So all have a great time at the Fourth Estate and if anything develops for Jan 28th or 29th, that's our next time around for DC.