The Guardian commented this event as combination of costumed creepiness of Halloween with the alcoholism of Christmas.
The ritual of burning witches is very popular in the Czech Republic. An ancient legend says that on the magic Walpurgis Night 30 April / 1 May, evil powers are at their peak of strength, and people must protect themselves, their households and cattle. Czechs inherited from their ancient Slavic forebears. These ancestors believed the forces of darkness were at their peak on 30 April and in the absence of holy water (not invented yet), hoped to purge the earth of evil by burning a witch in effigy.
This evening spend thousands people lighting a fire and roasting sausage.
Late evening, on the first of May -Friday 1st May
The twilit May - the time of love.
Meltingly called the turtle-dove,
Where rich and sweet pinewoods lay.
English translation one of the most romantic poem especially about the May by Karel Hynek Mácha. May Day on 1st May is an ancient spring festival and usually a public holiday, it is a tradition in many cultures. But in the late 19th century, May Day was chosen as the date fo International Worker's Day by the socialists and communists. International Workers' Day also known as Labour Day was a celebration of laborers and the working classes. Every year it is promoted by the international labor movement, anarchists, socialists and communists. Date of 1st May was chosen for International Workers' Day by the Second International to commemorate the Haymarket affair, which occurred in Chicago on 4th May 1886.
Since Velvet Revolution 1st May is in the Czech Republic Day of love – you can see young and old pairs finding a blossoming cherry tree and they are supposed to kiss to ensure a year a good health.