Announcing before 12 weeks

I will be 9w exactly on Christmas <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">Eve</a> when we have a really big family holiday party and I really want to announce our pregnancy then but I just go back and forth about whether or not it's the right decision to announce it before we are at the 12w mark. Things can happen at any time really so who's to say when the right time is to announce some really happy news? Kind of torn...