Just now the first Wizards Unite Community Day has just been announced by Niantic. On July 20, at yet unknown times, the first edition will take place. It’s still unknown what we can expect during this event. The day does not seem to be randomly chosen, because a day later it’s Community Day for Pokémon GO. This way, players of both games can play both Community Day’s.
For the time being, we suspect that at least a number of extra special foundables will appear and that you have a chance to win special spell books and items. As soon as we learn more about the Wizards Unite Community Day, we will let you know.