Consider having dinner in Callejon de la Loma (Mercedes, Tigre, Bliss, Steakhouse) where all the locals are gearing up for the big festivities. Around 10p its seems that the entire village begins the walk to the beach. I always found Callejon much more fun than the beach early in the evening.
Bar Restaurant Eze in Cabarete takes reservations for a nice evening with a Dinner and Celebration.
Don't think I am allowed to leave a link to their website..so you have to Google it.