The Santa Cruz Civic Auditorium is NOT a good place to see a symphony. Much better would be the San Jose Center for Performing Arts, or better yet, Davies Symphony Hall in San Francisco.
On the other hand, seeing Smashing Pumpkins at the Santa Cruz Civic Auditorium a few years ago was great, (of course one had to be in the crush of humanity on the floor in order to get good sound!) And the other event I saw there as a full contact karate event many, many years ago. Given the last two events I mentioned, it probably goes to show you that the Santa Cruz Civic is not exactly a perfect symphony hall! ;-)
My two cents worth.