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THE PALACE HOTEL — Web 2.0 Summit program chair John Battelle was racing about the site of the Web 2.0 Summit this morning, we hear. The cause of the last-minute scramble? "We still haven't heard from Marissa Mayer," an informant heard him say to a colleague. Could Google's eccentric queen of search be skipping out on the exclusive conference, where she's scheduled to speak? Battelle's tone suggested Mayer might not be the only star on the program missing in action. We'll report on who actually shows up — and any last-minute substitutions.