2. Event dates are May 31 - June 4, competition every day with the last day being the final. I want to announce the exact details ASAP, but there are a couple of things that need to be sorted still.
5. Filtered tap water is fine, not filtered I wouldn't drink
To answer your other questions:
- For Computex you want to stick to the Zhongxiao area around the Blue MRT line. Most of the activities are either in that area, or Xinyi (101), and Nangang. Everything is on the Blue MRT line.
- Red light districts can be found anywhere, but the most notorious near the city center is a street called Linsen Bei Lu.
- MRT "easycard" is the right way to travel. Taxi prices have gone up this year, but are still reasonable compared to other major cities.
- You can cross the entire Taipei city + periphery with a taxi in less about an hour. Compared to Tokyo, Taipei is really small