1. Team Clinton knew from internal polling that they were going to lose; thus, the reason for cancelling the NYC fireworks display, nearly a full week before the election. The fireworks were canceled Monday morning, 7 November.
The fireworks display was announced Thursday, 3 November.
I don't think either story came from the Clinton campaign.
When the original (Thursday) announcement came out, it was ascribed to a source in the FDNY, which issues permits for fireworks displays.
Info regarding the fireworks and the cancellation came out in patches.
See the convoluted paragraph from a Nov 7 FR thread:
Clinton Campaign Cancels New York Election Night Fireworks
Hillary Clinton's campaign has called off its planned election night firework display, it emerged Monday, the day before America goes to the polls. Staffers were going to put on a two-minute show over the Hudson River after the results come in on Tuesday, but the proposal has been canned, TMZ reported on Monday. The campaign called the Coast Guard last week to tell them the event was off, three days after the New York Post reported it was planning the bash - although the cancellation was secret until Monday.
News of cancellation emerged on Monday, Nov 7. But, the campaign called off the event 3 days [Nov 3] after the NY Post reported on Oct 31 that it was being planned. The cancellation was kept silent until Monday.
They knew a week earlier.