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You could go just for fun.:)

Usually, the keynotes are put on the interweb a few hours after it's done.

then, the servers slow down to a crawl as millions of Mac-nerds all try to watch it at the same time.
(go use the Apple store computer. Their connection is usually faster than my in-home anyway)
 
And I just wander on down to the internet café at about 3pm and get a perfect stream cause the majority of the world's Mac Addicts have gone off to the land of Nod.

Mind you, the keynote is at 4am my time - damn daylight saving.
 
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