As the name suggests, as soon as you get the invitation message, you click on it to be teleported to the Market. Then, you search for the GM (Game Master) there, and the first one to find and click on him receives the reward.

ايفنت باين من اسمه، اول ما بتجيلك الرسالة بتدوس عليها توديك الماركت، تدور علي الجي ام (GM) في الماركت، واللي يلاقيه يدوس عليه يستلم الهدية.