We are visiting Amsterdam in May and we have been looking at AFH website for ticket information. The ticket availability on the website, however, seems to be quite random. So in case we are not able to book tickets online, we are planning to go and buy the tickets from the counter a day before, at the time of their closing so that we don't find a long queue. For example, if we are planning to visit AFH on Sunday, we will go and buy tickets from the counter on Saturday at closing time. Does that work? Do they sell tickets in advance?