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In the New York Times:

"And it worked — boy, did it work. Visitors flooded Hulu upon its public opening in March 2008."


4. immediately or very soon after

5. on the occasion of

It seems to these two definitions are both fitting in this context. What's the meaning of "upon" here?

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up vote 4 down vote accepted

The fifth definition was intended here:

"And it worked — boy, did it work. Visitors flooded Hulu on the occasion of its public opening in March 2008."

The fourth definition was not intended, since the visitors did not come after the opening; they came during it.

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If dictionary.com is confusing you, try Wiktionary, which gives the meaning of "upon" as :

3.At a prescribed point in time

Thus, the visitors :

flooded Hulu at its public opening...

"At" should make it pretty clear.

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