By the way, you should really read George Antheil’s bio. It’s rare to find a composer who developed a radio guidance system for torpedoes (with actress Hedy Lamarr, no less; I am not making this up), and who was a friend of the poet Ezra Pound.
The Saint Paul Chamber Orchestra has a free app available for iPhone, iPad, and iTouch so you can enjoy their live concert webcasts and concert library wherever you go. The Detroit Symphony Orchestra has a free DSO To Go app which is available for iPhone, iPad, and Android.
What if you can’t make either concert? The SPCO has a free concert library that you can watch on demand. The DSO has their Replay performance archive, which is available for a year with a $50 donation to the DSO.
If you can’t make it, you will be able to view the webcast for a limited time on the website. Check out the website for other operas available for viewing on demand.