C1,
According to Government posts on FB, there have been multiple popup vaccination locations around the Dutch side in recent weeks. For example, 783 people were vaccinated at last Friday's popup at the Carnival Village. There is a popup at the Carnival Village on 7/16 from 12PM until 6PM, and one at the Kimsha Beach parking lot on 7/17.
Unfortunately, other posts suggest that vaccinations will be going into "maintenance mode" in August, and vaccines will only be available by appointment. Perhaps the success of some of these popups, plus the impending arrival of a new vaccine supply, will cause them to reconsider and add additional popups. They've already done that at least once.