I have to make a pasta bake for 20 people take it to the meeting 6 hours before it will be reheated for dinner. How do I stop all the sauce from being absorbed and the pasta going soggy.

I have to make a pasta bake for 20 people take it to the meeting 6 hours before it will be reheated for dinner. How do I stop all the sauce from being absorbed and the pasta going soggy. Thanks everyone for your suggestions. As a trial I have made a tomato based bake I cooled the pasta and sauce put it together and will heat it again in a few hours. If it is fine then I will make a bigger version next week.If not I will try again and my husband will be eating my trial pastas for the next week. Again thanks for the help.