Relax and have fun!! Most of the time these events are so charged with positive energy and everyone cheers for everyone else - you'll have a great time.

I just want to mention about food - if you have a sensitive stomach at all (like my husband) stay away from the gu and sugary type supplements. Stick with pasta, turkey sandwiches and if you like, try some perpetuem (I love that stuff for 24 hour races - it tastes mild and it's a quick 200 cals).

Good luck! Can't wait to hear how it goes!