As you already know, Mel Karmazin will be speaking at the National Press Club this upcoming Monday, July 23rd at 1pm ET. There's several ways you can watch Karmazin's speech:

In Person: If you're lucky enough to be in the area, you can attend the National Press Club event at 529 14th Street NW in Washington D.C. Cost is $16 for NPC members, $28 for guests of members, and $35 general admission. Lunch will be served at 12:30 pm, prior to the speech at 1:00 pm. Tickets can be reserved by calling (202) 662-7501.

On the Web: A live webcast of the speech will be available online at SIRIUSmerger.com and XMmerger.com as well on the investor section of Sirius' website - if you miss it, don't worry, the replay will be available in 2-hours following the speech.

On TV (maybe): You can also watch the event on C-SPAN television or on the C-SPAN website. The network's Monday schedule will not be posted until Friday afternoon, and so is subject to change based on the day's news. I'll update this post to confirm which C-SPAN channel will carry the speech.