The map of Equestrian Odysseys Prerelease Events, on August 21-23, has just been released! You can find the map right here, so go see if there's one near you! From the Facebook post:
Equestrian Odysseys Prerelease Events are coming on August 21-23 to hobby shops around United States and Canada, with more information on elsewhere in the world to come later. Participants at a Prerelease will get a promo copy of foil Pf1 Lyra, Ponyville's Got Talent, as well as 8 booster packs of Equestrian Odysseys with which to create a deck and play for more prizes!