For a formal setting like wedding, your watch should be elegant and simple.
A light moisturizer can keep you looking good without causing you to sweat because of heat or jitter.
Adding a pocket square is a classy way to inject a bit of colour into a formal jacket.
A white vest under short sleeved shirt will make your outfit look more structured.
keep your beard trimmer in bag of choice so you can always refresh yourself before a big meeting.
If you are getting the drinks for clients, make sure you pronounce them correctly.