If you are driving from San Gabriel Valley, Inland Empire, or Orange County, you can park at the El Monte Station (for free), the Metro Silver Line - bus ride is only about 20 min. to the Music Center.
If you are travelling from the Hollywood or downtown LA area, you can take the (Metro Red Line) subway to the Civic Center (1st/Hill) and it's a short walking distance to the Music Center. (you may be able to hear the loud music)
Update: Here's the link (courtesy of Kasia) http://www.musiccenter.org/events/activearts/Dance-Downtown/Upcoming-Events/90s-Night/