How can I assign slaves at parties, dinners? I have 5 slaves, but the only one I can assign to anything is Rebecca, for the others everything is grayed out. I tried not assigning them work, but that doesn't do anything (Rebecca is assigned as follower and as housemaid as well).
Also, can we buy slaves at the market in Watery Eyes? The text hints at it, but I only have the option of selling.