Would you support partially scheduled lore?
For example: The Harrowing now becomes the 'dark/evil' lore event.
Every year during the Harrowing we would get either: 1) More info about the Shadow Isles e.g. Next chapter of a champion's story, allegiance/relationship changes, aftermath of some event
2) Info about dark and mysterious beings/happenings e.g. Another Darkin, Void happenings, Nocturne enslaved by Annie
Similarly, another annual event like Snowdown will always feature Freljord-related news, an icy champion release/rework or an ARAM featured mode; Lunar Revel would feature some of the champions with Eastern/spiritual influences or Ionia.
In between these 'scheduled' releases we would get the regular champions/reworks and the occasional Shurima-like event (e.g. Mt. Targon + Arena Mode).