Mikado Children's Theater has two plays coming up this half-year, both of which have bilingual shows. Don't be put off by the fact you can't read anything on the first page, just go through and watch a few clips... and please turn down your speakers before you click on this link. You have been warned! Anyway, from the images you can see it could be fun to go one of their performances.
Mikado Theater address: Taipei city, Bade Road Sec 4, No. 765, 3F
Link to ticket sites for bilingual shows:
米卡多故事劇場-胖胖熊的心願 (March 6)
米卡多故事劇場-真假公主(中英文) (June 5)