Something I have considered recently would be if the doorways that had been opened up to the Realms of Death and Dreaming became even more unstable and thus people could fall into them accidentally like what happened during the previous landfall event.

Perhaps the new housing blocks would be centered in an area where the doors are more prominent. Perhaps the configuration of the rooming assignments could be involved with how the doors are affecting people or it could just be that people randomly run into each other more often in these realms because of it. The combined efforts of the people in the housing blocks could be needed to keep these doors in check or to survey what is found inside of them?

Another option could be something involving the baby turtles and their safety (or them protecting kedan and Foreigners?) if it doesn't interfere with other plot aspects with them.