Well, bear in mind that I've never cooked quite on that scale before (most I've done was sideboard lunch for 50) and I don't actually know a lot of dishes off the top of my head. So these are things I'm familiar with and could probably come up with something pretty close without looking them up again, but I couldn't necessarily do properly without at least taking 5 minutes to visit the sites that have them and printing them out.

Out on table/replenished as needed:
Breads (probably white and wheat, maybe rye; probably purchased) and herbed and plain butters.

First course:
Icelandic chicken pie (double-crust pie with chicken, bacon, and sage)
Armored turnips (just cause I could make it in my sleep at this point)
Salad of fresh greens and herbs, with balsamic vinegar dressing (totally winging it; I know there are period salads but I wouldn't know one if you dumped it on my head)

Second course:
Roast pork with currants, pine nuts, red wine (based on boar en brassey but as a roast instead of a stew)
Barley
Carrots & parsnips

Dessert:
Seasonal fruit
Bread pudding (again, I know there are period ones but I'd have to wing it) or Roman cheesecake
Glazed nuts maybe, if I'm not out of money by now. ;)

Budgeting, I always need help with. So it could be I just sunk us. ;) I'm guessing a $7 or $8 feast though? That's average around here.