Google searches.

And answers:

"st joseph's church,detroit, christmas eve mass 2010"

Here's what you want, and more!

Saturday, December 25, 2010
Solemnity of Christmas
Midnight Latin Tridentine Mass
Weihnachts-Responsorien with orchestra – Michael Haydn (11:30 PM Featured Prelude)
Mass in G with orchestra – W. A. Mozart
Dominus dixit – Gregorian chant
Laetentur caeli – Gregorian chant
Ave Verum – William Byrd
In splendoribus – Gregorian chant
O Magnum Mysterium – Tomas Luis de Victoria

Yeah, you definitely want to be there, Google user a.

"when is a good time to go to christmas eve mass at old st marys in detroit mi"

Well, Google user b, according to the events calendar on the OSM website, Carols will be at 11:30 pm, blessing of the Crib at 11:45 pm, and Mass at Midnight. I've never been, but I would imagine getting there at 11:15 would be a good idea. Or get there at 11 and pray the Joyful Mysteries of the Rosary in preparation. Or put a coat on your pew at 10:30 then play some Roulette next door. (I think the Rosary plan is better.)

I'm glad you found this little blog, and I hope you come back and find the answer for which you were looking!