New event is under way, throw a comment here if you want to or you can also do it in the secret event page here: https://kancolle.fandom.com/wiki/Spring_2021_Event
Obviously you should head here for up to date info: https://en.kancollewiki.net/Spring_2021_Event
Other good sources:
https://old.reddit.com/r/kancolle/comments/n7jr8d/discussion_spring_2021_event_megathread/
YT guide videos and info
J·Uchiha: https://www.youtube.com/channel/UCavs0hcHjq90CsrQ6AZLdzw/videos
Railgun: https://www.youtube.com/c/RailGun256/videos
Death Usagi: https://www.youtube.com/c/DeathUsagi/videos
For those who want a puzzle to solve: https://wikiwiki.jp/kancolle/