By Toby Sterling and Piroschka van de Wouw MAASTRICHT (Reuters) – The city streets around the Netherlands streamed with festival-goers wearing orange on Wednesday in celebration of the national holiday King’s Day in traditional fashion — with music and open-air markets — for the first time since 2019, without COVID-19 restrictions. King Willem-Alexander, who turns 55 on Wednesday and whom the holiday celebrates, was visiting the southern city of Maastricht with his family, keeping a promise that had been postponed for two years due to the pandemic. In Amsterdam, where Kings’ Eve is a party c…