Don't be, Eumeralla is a really tame venue. Night riding there is actually really pleasant and you'll only be doing about 2 1/4 hours of it - though last year after all the 3 hour riders pulled off the track it got really lonely. With more than three times the entries this year it should be quite a bit better.
I'll be out there trying to put in my best solo performance, though right now I'm not feeling confident (and rather over-trained/under-recovered).