International Workers' Day

(or International Labour Day)

Click here and find the answers to the following questions.
1. What other name does this day have?
2. What can you see in the streets?
3. Is it a national holiday?
4. What's its origin?
5. What did people claim in Chicago's demonstration in 1886?
6. Do Chinese people celebrate International Workers'/Labour day? 

Just for curiosity watch the following video.

Is "May Day" the same as "Mayday"?