Its hard, mawb, but please don't feel guilty. I suspect if there was a guilty emoticon it might get more than a little overused! The day wouldn't go well, you know it wouldn't, so as Jalima says plan some paw time with the family that will work for him and everyone else. I felt sad reading ann's post about the difficulties with their family visit and then to read yours. My heart goes out to you both. All you can do is your best, the families will understand and I am sure help you get around the difficulties, rather than trample through them. Pool all the thinking resources, see what the combined might of family thinking can come up with that works for you all.
Agree with Charlie, Soop maybe best to add some protection to the thin skin on your leg for the journey, the last thing you need is someone banging it with the corner of a case. I'm sure you and MacS will have a wonderful time and wish you well for your journey and the wedding celebrations.
Pouring here today, not happy a bit but am attacking the admin before a food shop later. Out all day tomorrow, meeting a friend for lunch and generally drifting about, so have that as a carrot to look forward to.