May - National Days of Countries and International Days

1
2 -
3 -  World Press Freedom Day, Poland constitution Day ,
4
5 - Netherlands,
6
7
8
9
10 - World Lupus Day
11 - National Technology Day (India)
12 - International Nurses Day ,
13
14 - Paraguay ,
15 - International Day of Families, Paraguay ,
16
17 - World Information Society Day, Norwey
18 - International Museum Day
19
20
21 - World Day for Cultural Diversity and Dialogue
22 - International Day for Biological Diversity, Yemen
23 - World Book and Copyright Day, World Turtle Day
24 - World Schizophrenia Day, Eritrea
25 - World Thyroid Day, Argentina, Jordan
26 - Georgia, Guyana
27
28 -  Azerbaizan, Ethiopia
29 - International Day of United Nations Peace Keepers
30
31 - World No-Tobacco Day


http://presscode.gr/index.php?option=com_gcalendar#year=2012&month=5&day=1&view=month