In reply to Plan Airborne: Good on you, this sounds like great fun. My first (and only) half marathon I managed to do on minimal training, I'd never run 12 miles in one go.
As for as advice goes it pays dividends to eat regularly as you train, don't bother with huge amounts of carbo loading. Try run more each week, capping at about 4 runs a week, any more and you risk injury.
Stop running completely the week before, don't even be tempted, in this week you'll want to up the protein slightly and the carbs a lot. Try for something like 60% carb diet.
Don't eat too much the night before, it's all well and good eating a huge plate of spaghetti but not when you need to drop the kids off at mile 6...
Try out some energy gels, these things got me round. If you haven't had them before then get a coulpe and find a flavour you like and a brand that doesn't make you feel too rough (possible upset stomachs). Take one every 3 miles or half an hour, whichever is quicker. You'll need a little water to help it down.
On the day continue your regular routine, don't try to shock your body, if you wake up every day to a cream cheese bagel and pint of white coffee with sugar then do it today. Hopefully you'll have had a good 8 hours sleep. When you get to the start line try some dynamic stretching, nothing static as it ruins your legs for running.
When the gun goes start SLOW. Runners run in negative splits, i.e. the first half is slower than the second half. You should be below pace for the first half and slightly over pace for the second, you're legs will come to you, don't worry about that.
This is kind of a personal thing but there is some science to it. Don't get it on with your partner the night before, it absolutely kills the mojo. If I got lucky the night before a big run/ride my legs feel rubbish. Don't risk it.
Most importantly, enjoy it. I had an absolute blast the whole way round. Bring friends/family and dot them around the route, you'll be lifted by anyone cheering. It's also good to give these guys a gel/some water so you aren't carrying it.