This is Autumn Equinox at Orilium Academy for 2024, specifically dedicated to people studying to be Master of Elements.  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of Magical Readathon in 2021, all of the announcements since, and a guide on what happened so far (it's a little outdated but will still help) and how to catch up.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.