Are the Events limited time or a yearly recurrence

Maybe it’s not even confirmed either way, but I saw at the end of the launch trailer there was an “March Event” starting on the 9th of March 2026 going until the 26th.

I was wondering if there’s any confirmation as to weather this is like an annual thing like animal crossing holidays or if this is a limited time event (LTE) where this’ll be the only opportunity to get certain Pokémon.

If anyone knows one way or the other that’d be great, cause if there’s gonna be a bunch of LTEs I wanna know, since that’ll greatly effect my chances of getting the game at all. Thank you!