Caltech as part of one of the most important Institutions in Pasadena enjoys to be involved with the community, that benefit our neighborhood, part of this benefits are its events on campus throughout the year at reasonable price or even free, just go to calendar of events
http://events.caltech.edu/calendar.html and you will find science lectures, performing arts, folk music, chamber music and more. Many of these events take place at the architectural masterpiece, The Beckman Auditorium, sometimes referred to as The Wedding Cake which has a capacity of 200 people. If you are able to walk before or after the event you will experiment a beautiful and relaxing surrounding.
http://caltechpresents.blogspot.com/
