If the entry page is open you can submit it, better early than late.
Entry advice is all over the place here but a few tips that seem to be consistent.
Have all your drivers lined up and on the form, sure you can add people later but having your whole team assembled shows you are organized and ready and will be able to take the spot if offered.
Have a good theme and tell them about it.
Have an interesting car, not mandatory but it helps. If they are weeding out teams and you are the 10th E30 in the past 5 minutes you wont stand out, but a Maserati BiTurbo...that stands out.
The key is having fun so make sure you reflect how you and your team will bring the fun!
http://wartburg.misfittoysracing.comOTTER: "I think that this situation absolutely requires a really futile and stupid gesture be done on somebody's part."
BLUTO: "We're just the guys to do it."