>>>Is this normal to have so many VBits conferences? Are any of these seen as the "main" conference. Are there any differences in content?
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>>The Biggie is SF one.
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>Is SF always the big one and is it always approx the same time each year? Even though SF is the biggest, do they all have the same content, speakers, etc...

Usually, SF is a day longer.

They always update the content. Soon you'll see sessions about SQL 2000.