Load in day

So I've dealt with this a few times but I'm not sure if the rules have changed.

We have a straggler that's not free until Wednesday at 7, while everyone else in our group on 4 camp passes took the day off to get there at opening.

It's my understanding that there's no reentry on what they call the first day, load in day.

I'm trying to politely find a solution that doesn't screw over the rest of the group.

Could the big group get the straggler on Thursday and be able to reenter the camp ground? Does anyone know where I could confirm this?