TubeNet

It's 11:24 ET...on Thursday and Act 1 of Tristan is coming to an end.
(I don't know if any of these will be archived or not.)

Tristan LIVE (in progress) on Thursday, Lohengrin Friday, Saturday Tannhauser, Sunday Parsifal,

Look over on the left at this link for "Radio Clasica." Underneath that, you'll see "En Directo." Click on the sideways RED triangle, and you are in!
http://www.rtve.es/radio/radioclasica/" target="_blank" target="_blank
Festival de Bayreuth. Transmisión directa.
WAGNER: Tristán e Isolda. R. Smith (ten.), R. Bass
(baj.), I. Theorin (sop.), J. Rasilainen (bar.), R. Lukas
(ten.), M. Breedt (mez.), Coro y Orq. del Festival de
Bayreuth. Dir.: P. Schneider.
Actually there will be 5 streams on consecutive days of these operas:
Subtract 6 hours for Eastern Time......
I don't think that they will be archived.
Wed 25. July, 06:00 PM CET...NOON ET..... Der fliegende Holländer
Thursday 26. July, 04:00 PM CET 10am ET Tristan und Isolde
Friday 27. July, 04:00 PM CET 10am ET Lohengrin
Saturday 28. July, 04:00 PM CET 10am ET Tannhäuser
Sunday 29. July, 04:00 PM CET 10am ET Parsifal

The intermissions can be long at Bayreuth. Act 1 of Tristan is in the books, and I believe the interval will be about one hour! Second act starts around 12:35- 12:40 ET on Thursday.