I'm not sure they offer a day rate. You will need a badge to access the areas and food and I don't know how they would control that once you had credentials. I suspect you could register for the full event and stay off grounds at a local camp and commute. I assume the 800 attended limit is due to space at the site. Best to check on the thread that is run by FROG. This will be my first attendance. I'm not sure how packed it will be. I will be coming from a over week long event in LaPorte. Go back to:
Forest River community forums>
The rally zone frog events>
2016 international annual frog rally Aug 14-20
User name F.R.O.G seems to be the lead guy. The entire thread there is full of apparent rally regulars. They can provide you options. As a Forest River product owner I don't see why they wouldn't want you to see what's going on.
If you go to the www.forestriverfrog.com
and click on e news tab there should be an article on registration and the tours.
2014 FR330 DS