There are links to program notes and audio material at this page.
All-Mozart Program: July 13 at Tanglewood
July 14 For Saturday evening, they are giving us a "Tanglewood 75th Anniversary Celebration."
Here's a more complete rundown from the detail page.
I'm definitely looking forward to the Choral Fantasy. The rest of it should be okay, too.
July 15 Here's the official description of the Sunday afternoon concert:
Stravinsky and Brahms: July 15 at Tanglewood
And here's the link to the page with the links to notes and audio previews. As I noted when it happened, the BSO and Tanglewood Festival Chorus, with Bernard Haitink as conductor, performed the Symphony of Psalms in the program which concluded the regular season two months ago.
The usual broadcast/webstreams are available from Classical New England, which also has its own information about the music to be performed.