The Gemara [Ksubos 3b] says:
כדתני' הרי שהיה פתו אפוי וטבחו טבוח ויינו מזוג ומת אביו של חתן או אמה של כלה מכניסין את המת לחדר ואת החתן ואת הכלה לחופה
..... It is as it is taught in a baraita: If one’s bread was baked, and his animal slaughtered, and his wine diluted, and all preparations for the wedding feast were complete, and the father of the groom or the mother of the bride died before the wedding, then before burying the deceased, which would trigger the onset of mourning, one moves the corpse into a room, and the bride and groom are ushered to the wedding canopy and they are married.
What is the din of moving the corpse into a room? Why is this necessary??? Get married, do what you have to do and worry about the מת later??!!!
