[Milton Miteybad]

Does "midnight mass" fulfill the requirement?

Certainly. I believe attending a Christmas Mass said earlier on Christmas Eve would also fulfill the obligation.

Many Protestant sects have Christmas and Easter services, and Southern congregations attend fairly heavily on those occasions. The overflow crowds at the churches for Christmas and Easter services is usually referred to by the preachers/pastors as the influx of "the C & E crowd," i.e., the mysterious appearance of church members who only bother to show up on Christmas and Easter, and at no other time.

It appears that many nominal members of Protestant congregations only feel obligated to attend services twice a year, at least in the South. ;-)

[virgil]

Correct. Vigil Masses celebrated earlier on Christmas Eve also fulfill the obligation, but they are not nearly as beautiful as the Midnight Mass. There’s nothing sweeter than humming baby Jesus to sleep to the tune of Silent Night by candle light.