Chum-tactic: the first filter applied to you, for press or investment or anything, is "Who sent you to me?" Some people think "Silicon Valley is a meritocracy" implies that the first filter would be merit. Ahem. Be meritorious, but make sure being meritorious makes an impression on someone who routinely has dinner with the people whose cooperation you need. (Hint: this happens spontaneously sometimes but that isn't the way to bet.)
P.S. Lots of the world and lots of situations work like this, with wide variations in local etiquette for what counts as an intro and what warrants one. "Who sent you?" is also the first filter for Chicago government contracting and Nagoya job offers.