Give your DJ or band a list of songs that you absolutely do NOT want played, as well as a list of ones you would like to hear and those for special parts of the day.
Do a trial makeup session with your makeup artist, or if you are doing your own. If you have sensitive skin, use your own makeup to prevent unexpected reactions.
Keep an online database or spreadsheet with the names of all invitees and RSVPs. Use the same list to note gifts given and thank you notes written.