Here's why:
* Physical events typically involve playing with physical cards and interacting with other players in person. These events don't rely on online accounts for participation.
* Online events might require a Pokemon Trainer Club account for registration and participation, as they rely on online platforms.
Therefore, if you're attending a local Pokemon Trading Card Game event in a store or at a tournament, you can participate without a Pokemon Trainer Club account. However, if you're looking to participate in online events, then a Pokemon Trainer Club account is generally required.