Good for you for sticking to your boundaries (and your Husband too!)
The fact that they showed up anyway is appalling, truly. Perhaps from now on they will take you seriously. Also great that you just stuck by your guns and didn't engage in the madness.
Personally? I wouldn't send announcements to other family members at all. This is a time when you should be peaceful and happy, not torn up about all of this insanity. They will all be fine (the family). Those that care will find out eventually and if you are close to any of them eventually you will talk and they will hear the happy news.
For now? Just circle the wagons as you have been doing, let all of them take care of themselves.