Tornaby and Ljungslöv are both fictional places. Just like Reftinge in End of Summer, Nedanås in Deeds of Autumn and Vedarp in Dead of Winter, they are based on the area where I grew up in north-western Skåne.
Walpurgis Eve in Sweden falls on April 30th. Walpurgis, or Valborgsmässoafton (‘Valborg’ for short), is the night where bonfires are lit to celebrate spring. Traditionally the bonfires were believed to ward off evil spirits, and today people still gather together to light the fires and sing. On May Day there are parades and festivals held across the country as May 1st has been a public holiday in Sweden since 1939.