Congratulations on this big moment in your life. And congratulations on being so sophisticated. To your friend’s party, wear your blue blazer, but now leave off the tie. Wear the softest white or light blue shirt you have under it — if dancing happens, you’ll want to take off your jacket. Otherwise, wear a polo shirt under your blazer if you think the party will become overheated. Jeans — blue or white — and no socks with your loafers or deck shoes.
Have a wonderful time. Try to remember it!