Not that easy
I asked the same question a week or so ago, and got little response. The DR tourist board in Miami doesn't respond to its e-mails, and the office in Chicago told (incorrectly) that there is only one celebration "in the country" and that's on Independence Day, the 27th of February. (The tourist board website has 2001 information, and nothing on next year, yet.) I was surprised that so few readers here are aware of accurate information on the topic (but, I'm certain some have other things to worry about), but I've done some reading and searching and came up with answers that, to me, seemed reasonably accurate...that there are celebrations in different parts of the country throughout February (primarily on Sundays), and, yes, there is a culmination on the 27th (or, really?) with the biggest celebration being in Santo Domingo. I, too, have read and heard from many sources, that the events in La Vega are considered to be the best (whatever "best" means to who's commenting).