I recently discovered the Culture Express magazine put out by the Taipei City Dept of Cultural Affairs and found it quite useful
It lists cultural events going on in Taipei, the locations, prices and times…and in Chinese, English and Japanese! Very nice to have a centralized source of information.
I got my copy at the Taipei City Visitor center in the underground mall between ChungHsiao FuXing and ChungHsiao DunHwa. They have a web site too, but it’s pretty poorly done… http://express.culture.gov.tw/