If you're going to cook, that's lovely (unless you're my MIL), but please if you say there will be food at 7pm, for the love of gods please ensure there is food by 7.15 if you want to avoid howling 3yos and by 8pm if you don't want a howling or fainting NotCitrus!
(MIL forgiven here as there's always piles of fruit and other stuff to snack on. And with luck we can convince her to cook some ready meals!)
Guests - we have a lovely bathroom with a lock. The downstairs loo has no lock. If I explain this to you and you decide to use the downstairs one anyway, it's your problem if ds tries to go in and use the potty.