March 17 is:

Saint Patrick's Day 

Submarine Day

Click on the date to find what special day it is: 

March
7	6	5	4	3	2	1
14	13	12	11	10	9	8
21	20	19	18	17	16	15
28	27	26	25	24	23	22
				31	30	29
Special days on different dates