May Day May Day

The opening question for today, did you celebrate May Day?
The next question, what is May Day all about? Well in fact there are several answers to that question. The picture shows how some Blue Mountains folk celebrated May Day this year. If you click on the picture it will take you to wikipedia where you can find the answers to the following questions.

1. Who are the Haymarket Martyrs?
2. What is Walpurgis Night?
3. When is International Workers' Day?
4. What was the Red Scare (in USA)?
5. What is the pagan May Day celebration about?