1) You can totally use this as a memory recovery mechanic! The memories won't be pulled from character's heads so much as... distributed via weird time/space stuff, so as long as the memory involves your character and fits the above criteria, go nuts.

2) Yeah, no memories will be harmed in the making of this event. No one's losing anything! More specifically, the memories will exist in the form of physical objects that, when interacted with, will allow the character to experience that memory. This means that characters could re-experience memories or continue to share them with others after the event is over.