It's not that unusual that the Giants are having a Japanese Herigate Night or a Chinese Heritage Night. In fact they will be on consecutive nights, May 22 and May 23.
If you buy tickets through the right place for each one you can get a Giants with Japanese characters on it, like this. The Chinese cap has Giants written in Chinese characters like this. So who wants to tell the Giants that the Japanese language uses Chinese characters? I hear the Dodgers will also be giving out caps spelling out LA in Spanish characters.
The Giants are also going to have two Irish Heritage Nights, three Singles nights, and two LBGT Singles Nights. Italians, African-Americans, and Jews also get their own nights.
San Francisco's vibrant Gagauz community apparently doesn't get its own night.