I just sent out an invitation for a Christmas-themed dinner to a bunch of friends via email. What's wrong about it? Or surprising? How would you let 9 people kn

I just sent out an invitation for a Christmas-themed dinner to a bunch of friends via email. What's wrong about it? Or surprising? How would you let 9 people know when they're expected to show up? Call each one individually just to say next Friday 8 o'clock?