Will you be singing at all of them?
Well...I'm Jesuit educated (high school level), so depending on your definition of Jesuit, you may already have a mole ;-).
Will you be singing at all of them?
As far as the Divine Office goes, yes, definitely.
Regarding the Masses, it depends on a number of factors. When the chanted Mass Ordinary, responses, and propers are called for, I will singing as a member of the scholae cantorum. There is a brief audition for the more musically endowed souls. If am accepted into this choir (God willing) I will sing some of the polyphonic settings with them, as well as the new Mass setting by Sir John Tavener.