International Performing Arts Festival (FIBA)
Every two years, FIBA transforms Buenos Aires into a giant theatre with performing arts shows wherever you look. It has been running since 1997 and has shows to cater to all tastes. Most of the performances are in Spanish but a few non language specific shows are also done. Tickets are normally bought per performance.
Web Site: http://www.festivaldeteatroba.gov.ar/home09/web/en/index.html