(in the ancient Roman calendar) the fifteenth day of March, May, July, or October, and the thirteenth day of the other months.It's not the fifteenth of November, just the fifteenth of March, May, July, and October.
The rest of the months get the ides over with on the thirteenth.
So if anything bad was going to happen to you on the ides of November, for which you should've been aware, it's already happened.
Nothing's quite as dangerous as the ides of March, of course. But this year, the ides of November having been on Friday the 13th, it could've been bad.
There must have been someone out there who had a terrible day on Nov. 13. To those people I would've said, Beware the Ides of November. But now that it's over, sorry about that.