First, go out now and buy shoes at Kohls for the "big race" tomorrow. Next, no matter what temperature, dress for at least 30 degrees colder than it actually is, which means lots of layering. Third if the event starts at 8, be at the start no later than 6:30 and do as many strides as possible for the next 90 minutes to warm up. Fourth, about 30 minutes prior to the event strap on the 4 bottle fuel belt and start consuming Powerbars and gels. Fifth, about 15 minutes prior to the start, position yourself at the start line, front and center. And last take up as much room as possible on the course the first mile. Those idiots doing 5:30 miles need to run around you waddling thru your 10:15 opening mile before pulling over at a water stop to massage a cramp.
The rest of the day post on social media how "you were that close" to getting a pie by finishing in the top 1000.