"In February of 1998, TGTW (The Gathering Taiwan) was held with the presence of KANDU members to ensure the same creative, easygoing and informal environment prevails. Computer leaders of the future connects and networks for the first time!"

https://archive.gathering.org/espresso/pages/tg05/press/History_of_TG/view_top.html

It is also mentioned on Kandu's web site. Judging by the description, it could very well be that they had creative competitions there. 'Since Tg 1992 Light, Gathering 95 and 2020 Online (no competitions( are listed, I think both TG 1998 and TG Origins should be listed.

Shady was quoted in the Tekno magazine 02/98 that TG Taiwan had demos that got finished. https://ftp.gathering.org/TG/1998/Articles/Sol199802.jpg

Sources used for this, including a picture. The image is a piece of demoscene history. It is highly likely this was the first demoscene event in the country and in Asia in general. At the very least, one of the earliest events.

Announcement article in local news:
https://www.ithome.com.tw/news/5024

Review and statistics:
https://www.ithome.com.tw/news/5169

Image:
https://nrch.culture.tw/nrch/zh-tw/nrchdata/1002491

I've changed my mind on Origins after some more research. It was a one-off use of the name for what seems a rather lame event with a pure gaming focus.