If the ride starts in the morning, and it gets dark at night, and a bike needs to travel at least 3 mph to stay upright, it is unlikely you need reflectors. If you are leading, there won't be any other bikes in the transition area. You will find your spot no problem. Just like when you are the only car in the parking lot at the ball game. Otherwise, you will probably get lost.
Many bikes look alike.
Many people look alike, especially with dark glasses on. Make a careful mental note of where your bike is racked. Regular pedicures help too. Well you can practice running without socks like you should in the race. Socks work great on your typical jog, but wet socks and wet feet spell blisters during a triathlon.