I went to the Van Gogh Museum website to find out about purchasing tickets online for a day during my trip to Amsterdam, September 8-11, 2012. I'm confused--it says tickets are good until August 31, and then it explains that the museum will be closed beginning September 24, but it doesn't say anything about the dates between Aug. 31 and Sept. 24. Does anyone know how I can get a ticket between those dates? Or is it not possible? Any info would be appreciated! Thanks!