[em-bee]

i know that feeling, it's like you are chasing after your friends, and need to put in energy to figure out when they are free because you don't already know their schedule.

i have a gut feeling though that if you don't already know the schedule of your friends, and (as you mentioned) you aren't comfortable to share your detailed schedule with them, then maybe they are not that close and you won't miss them if you don't see them every week.

if you do miss them, then pick one or two that you feel close enough to actually share your detailed schedule and let them help with coordinating with the others.