I made two fully cooked pans of a white lasagna in foil pans and froze them two days in advance. To reheat, I put foil on top and baked in the oven(frozen) for three hours at three fifty. Used a quick read thermometer until the center got up around, I don't know, 160-180 and everyone loved it. The critical stuff is to watch for drying out,(add chicken broth or maybe some more marinara) and if you want to bubbly-up and brown the cheese to remove the foil the last 10-15 minutes and watch closely. Oh yeah, this was a church group also. ps: don't freeze this stuff twice, send it home with your friends for their lunch....