About Oak Bluffs Open Market...May, June, Sept, Oct. 10 am-2 pm; July & August, 9 am-1 pm: Enjoy Sundays in the park by the sea! The OB Market is an ever-changing fun mix of local produce, specialty foods, arts, crafts, antique & vintage dealers, massage and more. Enjoy live music by Rob Myers. Conveniently located in Washington Park, (between Our Market and the Ocean View Restaurant). The Market will be held on Sundays, May 13th – October 28th. Interested vendors please contact us. Also two markets, one each in November and December, dates tba..