Just make sure that everyone knows the date, perhaps an anonymous post in the flight dispatch would do the trick, after that it will spread...
My suggestion is don't wait around, don't let this subject die and be forgotten, do it quickly...
Mr. Int from above, since you had the ideia, why don't you come up with the date? My suggestion.... do it in March....
I'm a team player, I want the best for the group, but I have to agree with other posts here, don't judge fellow pilots and called them cowards just because they decided not to call in sick, it's an option not a mandatory thing...
Safe flying guys...