Table place setting name help for unknown guest

I wouldn't put anything. If your tables hold 8, just have 7 names listed on the plan for that table and ask whoever is setting up your room to leave the space next to your dad without a place card.

Depending on what you're doing, could you just have a blank one to fill in on the day?

How far in advance do you need to prepare/print your table plan/place settings? Most care agencies and homes will set their rotas at least couple of weeks in advance., will this give you time? If you need longer, perhaps you could contact them and ask, if you explain why you are asking they may be prepared to designate a specific person to your Dad on that day in advance. Especially if there is a carer your Dad particularly likes. If not I think it is acceptable to ask the venue to keep a setting clear and with no name card, or listing on the seating plan. I'm sure a professional would understand. We were in this situation with my Granddad, but his health has deteriorated since then and although he still might be at the church, he definitely won't make it to the reception.

This.

I wouldn't put anything either, it will be obvious when there's a space next to your dad who it will be for. Care staff can change up to that day so I wouldn't go to the hassle of finding out their name.