You are correct. 25 December and 25 March.
The only local churches I have seen it happen, however, are St. Pat's and HR.
Which is how I know :) Did you hear that the new Provicial for the Western Dominican Province is Fr. Emmerich Vogt? I think this will be a good thing, he wasn't so hot at the administrative stuff, but excellent at the spiritual stuff. The last guy was an utter disaster, to replace him with a priest that Mother Theresa personally requested retreats from should be good.