To open up these events with the pros, you need to complete the pro challenge list on the menu screen. Press
to bring up this information on the screen. Alternatively, you can view your challenges though your phone by pressing
all your challenges, which will help you progress are listed in your phone.
This is simply the hardest and most frustrating achievement in the game. As you progress, you will open up challenges to follow a pro and complete tricks while going though gates. The reason this is so annoying is down to the fact you need to complete complex tricks in small areas and make sure you get though the gates as well and beat the pros score, which isn't impossible, but it will require some practice and patience. You will also need to complete at least two events See "Huck Magazine Event Winner" for further details.
Mini Guide HERE