The Huffington Post's Katharine Zaleski points out that, whatever the Clinton camp may have claimed, the scheduling conflict seemed to be a fundraiser at Ron Perelman's estate in the Hamptons. (She's even got the invite.)
From a marketing perspective, this would seem pure folly. The candidate disses the loudest, most organized group of progressives in the Democratic party. Surely, you don't treat "influencers" this way. Unless, of course, you think money matters more and you suspect that the "influencers" are much more bark than bite.