Here is a list of German Textbooks, some Online sites, their Infos and the Level for each ressource provided.
01st may in Germany : In Germany it’s also called Labor Day. Traditionally people head to the streets protesting about labour conditions with the trade unions. May Day (Der Erste Mai, Tag der Arbeit) is an ancient festival to welcome the spring weather and to drive away evil spirits. It is also an occasion to campaign for and celebrate workers rights, particularly in Berlin. May 1 is a public holiday in all German states. https://www.iamexpat.de/lifestyle/lifestyle-news/unique-history-may-day-germany