Whenever possible, pick up your bib number, timing chip, and goody bag the day before the race. This way, you won't have to worry about rushing to get it on the morning of the race. (Added bonus - you will be more likely to get your desired race T-shirt size if you pick it up early!)
Once you have your bib number, pin it to the front of the shirt you will wear on race day. (Don't pin it to the back). Most races will have boxes of safety pins for your use. Take four so that you can fasten all 4 corners.
Dressing The Part
For race attire, consider some "throw away" warmups for the start. These will protect you from the elements if it is cold or rainy. Old socks can come in handy for keeping your hands warm. Some runners will even wear the t-shirt for the first couple miles of the race until they warm up and then pull it off and throw it away. This is a good strategy to prepare for all temperatures.
