Link to blog post: http://blog.pokemonlegends.com/fall-of-the-summer/
What is this? A Summer event?
No, it's after summer.
Nope, not Halloween yet.
Yeah, that's probably it!
With the release of the legendary storyline a while back people have been eagerly awaiting a method to mass hoard Rebirth Crystals, which only occurs during events. But summer has already passed and we still wanted an event, so why not celebrate the annual migration of creatures that begins for both the beginning (or end of) what is the wintry season? We thought about that too but the NPCs of Orden weren't so cooperative... we had to make a deal with them if we were going to rent their properties for a celebration of any kind.
As such, anyone who wants to join in on the crystal gathering festivities at the end must first help out a rancher in the Eastbourne Farmlands. You can register to volunteer your time at this worker who is inspecting logs on the road:
The rest of the event will last for 2 weeks, ending on October 21, 2017!
Special thanks to GrannyMaths for the event/post name