I've finally heard from #3. The two dates that my advisor (may he live forever) and #2 (upon whom may light shine) have in common also happen to be dates that #3 has mostly free!
Just wait, with my luck those two dates will be when #4 plans to be in Glasgow by way of Bolivia and has no chance of being on campus or near a phone. This may be the time for lighting a virtual candle to St. Jude.
Back to work!
Update: hurrah for St Jude! #4 actually has time available on both of those days. Amazing! Now to actually pick a time and date. Eeeek - must look into the appropriate Saints' Days, Good Karma Days, birthdays of ex-boyfriends, etc.