Answer: Communist
Communists take May Day very seriously, which is why the holiday is so popular in places like Russia, China and North Korea.

Answer: Morris Dance
Morris dance is a distinctive, colorful routine performed in England during various traditional festivals, including those associated with May Day.

Answer: 17th Century
For a few years in the mid 17th Century, the church abolished May Day due to its revelrous nature until it was reinstated by King Charles II.

Answer: Monday
In order for everyone to get May Day off in England, May 1st would have to be on a Monday.

Answer: Saint Walpurgis
Large parts of Central and Northern Europe celebrated Walpurgis Night in acknowledgement of the saint of the same name who was canonized on 1 May, 870.

Answer: Fertility
Being a holiday set in the season of Spring, the pagan societies which created May Day of course used to occasion the celebrate fertility.

Answer: United States
The bloody Haymarket Affair was a riot that took place in Chicago (United States) in 1886. This incident was founded in labor demonstrations.

Answer: International Workers Day
Although on the surface International Workers Day has nothing to do with ancient recognition of May Day, the former is actually founded in the latter.

Answer: May 1
May Day, in its various incarnations, is usually held around the world on May 1st.

Answer: Lily of the Valley
In France, it is very common for people to gift friends, acquaintances, and family members Lilies of the Valley on May Day. This tradition was founded by King Charles IX of France, due to himself receiving one as a gift on 1 May 1561.