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This dinner is for the night the day after prom, once everyone has recovered from the festivities.
I'll have to talk to my sister and her friends and see what they're thinking.

I fixed it! It may sound crazy but I poured it out of the pie crust this morning and re-cooked it over the stove until it had really really thickened, and then put it back in. Doesn't look as pretty anymore, but it's a real pie now!
Thanks for your help everyone :)

Hilary Clinton's recipe for chocolate chip oatmeal cookies are my favorite cookies in the world and are always popular! I've been making them for many years now and they can't fail. You can google the recipe I'm sure.

My mom's "gourmet potatoes" with cheddar cheese, sour cream, scallions.. yum!

I believe that High Maltose Corn Syrup is the same as maltodextrin (someone please correct me if I'm wrong). It's not nearly as sweet as HFCS, but seems to be commonly used.
As a soon-to-be college graduate with a nutrition degree, I don't know too much about HMCS, but would always prefer a product with sugar rather than corn syrup. In the HFCS, it's the high levels of fructose that scare me (as it can only be metabolized in the liver), however I'm not so sure about how maltose is metabolized.
I have tried to cut down on my consumption of corn syrup of all kinds, and it's really amazing to note that it's in just about every processed food product! I am a strong advocate of 'everything in moderation', so rather than trying to eliminate corn syrup from one's diet, I think it's much more realistic to try to choose foods that have it further down on the ingredient label. If it's the first ingredient in those granola bars, well, I guess it's up to you. Just how good are they?

I talked to the 'kids' tonight to finalize plans, so I can start shopping and cooking tomorrow. They have a fancy dinner tomorrow night before prom, and an expensive brunch the morning after in the hotel, so this dinner is basically a relaxed, fun meal in their suite. We decided on a couple of pans of macaroni and cheese, garlic bread, salad, and tiramisu. I hope all goes well!

We got crepes after my senior prom, but I'm having trouble remembering my junior prom......I think it involved Jack Daniels.

Honestly I don't think it's fair to label lasagne "kid food," and if they're renting a hotel room that means they're gonna be drinking, and not wine-tasting drinking, case of Keystone Light drinking. If this is the case, they're going to want a big, hearty meal, especially if there's boys involved. Then again, I don't know your sister or her friends, I'm just judging this on having been a teenager 3 short years ago, and knowing that 95% of teenagers would appreciate something simple, classic, and filling. Hey - if I was still the size I was in high school, I'd eat mac and cheese and french fries almost every day - no shame in that!

I'm glad I'm not the only pasta-loather. I hate pasta, particularly baked things (insert obligatory high school baked joke here).

But it doesn't need to be 'kid food,' either, that's why I like the cold spread--chicken, salami, bread, olives (and I still say cake is always welcome)--it's classy without being pretentious and good finger food for picking. Cookies, chocolates, fruit, would be fine too.

What I ate at my junior prom (I was not *sniff* asked to the senior prom):

We had ice cream sundaes made at home afterwards--that's an idea!

Pancakes for breakfast.

A waffle (frozen before?) bar with ice cream, toppings, fruit, ect. might be nice, and cold fried or roast chicken for the people who want protien. Or nice chicken wings :p

One popular dessert thing I sometimes see is a 'candy bar' of different kinds of candy, to be used as toppings on cupcakes, ice cream, waffles, etc.

See, the key to prom is that you have a nice, elegant dinner beforehand, then go dancing, then get absolutely blitzed (if that's your scene) or otherwise spend the wee hours of the night in hilarious high-jinks.

No! Tomato sauce + girls in expensive dresses and guys with white cumberbuns. No! Teenage girls who have been starving themselves for weeks to fit into said dresses No!

For an after-prom party, I think a cold 'picnic' style spread would be romantic--some roast chickens (chicken should be cheap), baguettes, cheeses, salamis (for the guys), hummus, and other simple appetizers. Marinated vegetables, potato salad. Perhaps a more elaborate cake, since that is easy to transport.