(1) If it is a Chinese Sports Lottery, you can join, just contact the Sports Lottery Center.

(2) If it is a domestic sporting goods brand, you can of course join, depending on which brand you want to add. There are many domestic specialty stores.

(3) If it is a sports event in China, it will not work. Domestic sports events are organized through competitions, but they cannot join, and are undertaken by cities and units.

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Consider it a satisfactory answer, and trust me privately if you have any questions!