For the big day....relax and enjoy it!!! Don't worry about the little things that might not go as intended...after all of the planning, it's about the two of you in the end so try to have fun
For the days to come, stay close and communicate openly. Listen to one another without attacking or being judgmental. Give each other the space to grow as individuals and the closeness to feel as one. Put your marriage first and keep it there.
My best to you both on your big day and those to follow.