Yes, May Day is a real holiday. In some countries, it's Internatiol Labour Day (explains why Arya is off of work), others it's just a day of celebration.
I was in Rome for May Day last year, and the city shut down. No cabs, buses, or stores were open, but Oasis and a few other bands did have a concert in front of The Basilica of St. John in Lateran (ie, the most important church in the Catholic, if not the Christian, world).
In some countries, it's Internatiol Labour Day (explains why Arya is off of work), others it's just a day of celebration. 
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