Apprentices don't go to the Moonstone/Moonpool/the sacred object anymore.

* I feel like this can be ignored. The main reason this event even happens is to show the Moon__ exists to the reader, so it doesn't feel out of nowhere when the MC becomes leader. This can be justified via Clan culture, however! My personal headcanon is that WindClan brings apprentices to the Moonstone before they become warriors. StarClan gives them their warrior names instead, which they announce upon returning to the expectant Clan.
If it's not for explaining Clan culture or for a crucial plot point, I think this event can be ignored, unless you have a different version of the Moonstone/pool.