Family unable to make it

Really sorry to hear your partner's grandmother isn't well. Depending on what she's up to, could you do something like an early bridal shower/ afternoon tea, even if its just at home where you all dress up and raise a glass? There are lots of companies who will do grazing tables or afternoon tea at home catering. Of course its no substitute for the real thing but it might be a nice way to mark the occasion. You could wear something white and have a couple of speeches - or even have a bit of fun with it and get a veil and top hat from the joke shop.

Thank you so much for your message! she does like an afternoon tea, i previously worked in a hotel that hired an area for private afternoon tea parties! i definitely like the idea of a veil and hat though, i think she'd like that! she always told us how shes excited to buy her hat haha