Yaonkie,
I think waiting until 1 week before the hike might be cutting it a little close. If possible, you might get together 2-3 weeks ahead of time. This allows time to get any gear that might be missing. Unless of course, there is frequent and effective communication ahead of time.

Take a look at the TLB website (the site that hosts these forums) and look over the gearlists and see if ya'll have what you need.