I'm guessing nothing of any significance.
As a loyal citizen of the glorious land known as China, I can verify that nothing happened on June 4th, 1989. Anyone who says otherwise is a degenerate who is working to undermine the Glorious Unity of China! Now that you have been enlightened, humble worker, the Chinese Communist Party implores that you return to your honest work in the rice fields to help secure unity in your land! And remember to distance yourself from the source of this traitorous filth.
Glory to All of China!