I did it! I made it through the wedding and reception and all the things!
My dress and shoes fit (not my new underwear but 2/3 ain't bad), my hair worked out (I will die on the banana clip hill plus I found a sun hat to match), my makeup worked out (I managed to not-goth and just look a little pale vs dead).
The estranged daughter and I have a lot of shit to work on, but a lot of information was traded and things discussed and there's definitely progress toward working out said shit that needs woring on. The mother/son dance went great, we danced together and sang 'Wonderwall' and we could hear other people singing with us and it turned into A Moment.
I even gave a toast speech completely off the cuff. I don't feel quite as weird about the in-laws anymore since so many of them made it a point to come introduce themselves and talk to me that there's a Godfather joke in there somewhere. Then we all danced to 'Low' and who can be all standoffish after that, really?
Then, everything at home was as wel left it. I couldn't really ask for a more perfect day.
Everybody who was like 'it'll be great, celebrate your son and his family and just ride the wave' when I bled into the 'RL Peeves' section - you were all right, and I couldn't be happier that you were.