No special condition. Even if you haven't taken GMAT or TOEFL, you can gain some essential information about MBA application as long as you plan to apply for MBA. Through this gathering, you can also make friends with many people who have the similar interests and goals.
Of course, if you have prepared the hardwares, this gathering will help you speed up the application, because we will provide you much valuable information that would take you several months to search for. And if you have written the resume, you can bring it with you so that I can give you some suggestion and make a free evaluation.