Did this once, worked really well.
Hire a local gymnasium (may cost as much as $100). Get friend to cook a romantic meal and dress as waiter. Get a CD player, or if you have a friend who is a musician (violin preferable) turn all lights in gym off. Set up a table with lace table cloth in middle of gym with candles burning, fine china.
You and she dress as if you are going out on a night on the town. Tell her you first have to stop at the school for some papers, business, or whatever, but get her inside (this is actually the hardest part of the whole deal). When you get inside, the romantic music will be going, and the friend/waiter will show you to the table in the center of the gym and serve you your own private specially prepared meal and a fine bottle of wine.