Theme Dinner nights

Can anyone tell me if they have "theme" dinners on the Zaandam? The HAL website doesn't mention it, but I've seen other posts about them. I'd like our party to be appropriately dressed if so...

Haven't seen Theme nights on HAL for years. No need for anyone to special clothing.

They do have a Dutch night on all their ships but they provide the little Dutch bonnets for the ladies and the Dutchboy caps for the men, I also remember from last year them having a Caribbean night and buffet around the pool, so a brightly colored shirt or outfit would work well for that, have a great cruise....jean