AMSTERDAM—Dutch music fans have been banned for months from going to large-scale music festivals due to coronavirus restrictions. On Saturday, the festivals came to them. Hundreds of performers and festival organizers held marches through six Dutch cities on Saturday to protest what they argue are unfair restrictions that have forced the cancellation of summer music festivals and other events. Thousands of people attended one of the “Unmute Us” marches in Amsterdam, walking and dancing behind a convoy of trucks carrying DJs and sound systems pumping out music. Leonie der Verkleij, a freelancer who works in hospitality services at events, was among those marching in Amsterdam. “The festival industry feels like an unwanted child,” she said. “It feels like all sectors are important except ours.” The Dutch government has banned large-scale events such as festivals until at least Sept. 19 amid fears over the spread of the highly infectious Delta variant. …