For the record, anyone and their brother has a "ball" for inauguration. The President elect usually hits about 6-10 of the hundreds of balls going on that night. They usually arrive, dance for about 5 minutes and leave.
Having been before, traffic is a nightmare and depending on security, personal cars may or may not be allowed in some areas. Taxis need to be booked now. Limo service is probably already booked. This will be made even worse by the recent decision to allow the bars to remain open all night.
I'm glad I went to the one I did to because not everyone can say they've been, but I don't think I'd do it again. Like a PP said - mediocre food, watered down drinks and people hoping to one day "be someone" is the norm for these things.