The maximum group size is 12 and there is one permit per night per backcountry zone issued for a group. There are two permits per night per zone issued to parties of up to seven people. One person counts as a party. There could be as many as 26 heartbeats overnight in a zone. Dogs and packstock count in the allowed number.
They do not allow an organization (think Boy Scouts) to have more than one group or party per night per zone.
Does that make sense?
I think I can be there for the 27 to 30, but it is not certain.
It ain't what you don't know that gets you into trouble. It's what you know for sure that just ain't so.
- Mark Twain