This is Spring Equinox at Orilium Academy for 2024, it's part of Magical Readathon by G. Book Roast on youtube. Here's the announcement for this edition, here's the playlist for Magical Readathon where you will find first announcement of Magical Readathon in 2021, all of the announcements since, and a guide on what happened so far (it's a little outdated but will still help) and how to catch up.
Here's Gdrive.
This is specifically for career Master of Elements, in case you don't anticipate reading more than 6 books for your career and don't want to join the general Spring Equinox challenge.