Bonjour G !
Aller in this context is used for people, but not for events.It means "how are you?" in the sense of "how are you going [health/life-wise]?", so it doesn't work for inanimate objects :)
Bonne journée !
The goal of the lesson is to practice the use of "passer" in its variants. Hence you're supposed to use an appropriate construction in your reply.
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