[Answer] Which Halloween-like tradition marked throughout Europe and Scandinavia on April 30 involves large crowds of costumed witches and devils, a daylong party, a parade and a bonfire?

Step 1 : Introduction to the question " Which Halloween-like tradition marked throughout Europe and Scandinavia on April 30 involves large crowds of costumed witches and devils, a daylong party, a parade and a bonfire? "

...1. Fastelavn 2. Yu Lan 3. Walpurgis Night 4. Daimonji

[Ans] On which day is Walpurgis Night celebrated across Scandinavia and northern Europe?

Step 1 : Introduction to the question "On which day is Walpurgis Night celebrated across Scandinavia and northern Europe?"

...elebrations, more for adults as there is usually a generous flow of alcohol, begin on the evening of April 30 and carry-over into the next day. The day after is for familiy; a time when friends and relatives picnic in parks to celebrate spring's arrival. Source: Britannica.co