Hope folks in Taiwan will organize similar events. But don't use R.O.C. songs and anthems. Use Taiwanese folk songs and for a national anthem, how about, "Verdant Taiwan"? We'll also need a Taiwan focused flag.
雨夜花 (though a different arrangement than the video below might be better....)
《台灣翠青》 詞：鄭兒玉 / 曲：蕭泰然 * Tâi-ôan Chhùi-chhiⁿ - words: Tīⁿ Jyi-giokk; music: Siau Thài-jiân
You could use the Republic of Taiwan flag from 1895, only modify it to make it into a Taiwan Clouded Leopard instead of a tiger:
There are lots of other possibilities. Perhaps we should have a mix?