A status can tag up 10 users, status with location can tag up to 20 users, a photo can tag up to 50 users.
So if you wanna tag more than 20 people in your status, like 50 people in your status, it is not possible. But you might wanna upload a picture and tag your friends in the pictures, so that they will get notified. Otherwise, if you don't want to upload a picture, you can just tag your friend under your Christmas status comment box. They will receive notification about it too. :)
Hope it helps!