Pokemon GO events across Europe delayed following Chicago Fest fiasco
Unfortunately, if you've already purchased tickets for any of the first four, then you'll have to wait for Niantic to announce when they will take place since they have been postponed until a date late in the fall.
We apologize for any inconvenience and hope you understand that our priority is to ensure a great experience for Pokémon GO Trainers in Europe and around the world.
To make it up for the delay, Niantic announced that some Pokemon that are rarely seen in Europe would soon be appearing in certain European cities for a brief time.
source: Niantic
Things that are NOT allowed: