Anton's advice of camping at Outpost camp is recommended by several I know. It DOES help with acclimatization, as sleeping at 12k Trail Camp can bring on symptoms that wouldn't occur lower down. There is also some significance to hiking from there, getting to the top and back down to 10k in short-enough time that AMS will not set in as strongly. Sleeping at 12k means people are more susceptible.
On the other hand, this group is planning to spend several days before the hike doing light hikes at elevation, which tends alleviate the jolt to the system that climbing to Trail Camp causes.
Katrina: beware of people opting to join your group late (not spending the days before at Lone Pine). If anyone does that, the Outpost Camp option is a way better idea.
