moisturise lots exfoliate lots and book the spray tan, i went to a wedding once with very very orange hands and ankles loved that look!!! (not) enjoy the day.
Not sure about the others but i used to use that johnsons, holiday skin or something i think it was called, supposed to be a slow building natural tan... eeeekkkk orange knees
Whatever you do don't do a home tan for such a special occasion - it is not worth the risk. Definitely go for professional spray tan as most others have suggested. Have a lovely day