<I'm laughing, but I totally get it....> First off, don't worry about it, believe it or not, you'll be fine. Get all of your stuff for your race ready before you take off for your festivities so that you don't have to worry about it when you get home. Have a good time, just watch what you eat and drink.
The night of my first HM I had to deal with an incredible storm and a teenage daughter that was out in it and stuck on a flooded street, and yes it was almost midnight. I wound up getting to sleep around 1:30AM for a 5AM wake up. Like you, I was wound up, annoyed at the situation, and frustrated for all the reasons that you are. But despite all that I had a great run, lots of fun, and a great nap after I got home. It sucks sometimes, but then again, that's why we run - to let it all unwind!
-bill
http://runningthrutime.blogspot.com
(what do I know...? I'm just getting old...)