I would call my theme "classy take out".
I know whre you live if you are going to Ravinia...my son lives in Buffalo Grove and his wife grew up in Deerfield. Everything is available to you.
I would buy something lovely, precooked...perhaps Dorfflers would do you something like pre cooked beef tenderloin that you could slice and serve with an assortment or bottled sauces and breads....or several chickens on a spit.
How about Chinese take out? You can keep hot stuff hot in a coleman cooler. And everyone could add to that.
Do you have one of those tables in a bag that are so much used at Ravinia? and chop sticks...I know they make square black plastic plates ( normally I eschew disposable...but I'll give permission this time! LOL!)
You can also buy those white boxes and use them for leftovers or anything that yo think of.
Head to the dollar store and see what you can find for table decorations.
You could tell the others that the theme is "Chinese"....and since you have no kitchen...you can do take out.....and they can do soup....veggies etc.
Linda C

Do you have a grill at home? I'd be tempted to go with take-out as well, but if you are looking to make something yourself, this could be a good option for prep without a kitchen.

I have a Pampered Chef recipe for grilled vegetable ratatouille with a simple balsamic vinegarette that gets good reviews and is pretty simple to throw together. (You could probably work it out without a recipe, but you can email me through my blog if you'd like it)

You could go with a vegetarian theme, or try to stump everyone and go with a Disney/movie theme :)

You could also go with a "construction site" theme and have some sort of "build your own entree." You could bring items to assemble dinner salads or wrap sandwiches. Fajitas would be good - it sounds like you guys have had to solve the keeping food hot problem before.

That might be a good way to take some of the pressure off yourself by reminding folks that you are mid-remodel and it might not be as gourmet as usual.

Here is a link that might be useful: craftfetish blog

How about a fondue party? You should be able to rent the equipment. You could bring the meat and sauce for it, while the others brought sides with dipping and cheese sauces and chocolate fondue with cake and fruit to dip.