Vote for your three favorite entries:
@Marynator #1:
The Nativity of the Blessed Virgin Mary (September 8th)
@Marynator #2:
National Yoga Month
@Avro Arrow #1:
Day of the Programmer (September 13th)
@Avro Arrow #2
Star Trek Day (September 8th)
@Kai "the spy" #1
International Literacy Day (September 8th)
@Kai "the spy" #2
German Butterbrot Day (September 25th)
@auntiehill
Talk like a Pirate Day (September 19th)
@rhubarbodendron #1
German Day of the Zebra-Crossing (September 1st)
@rhubarbodendron #2
Japanese Chrysanthemum Festival (September 9th)
@Dimesdan #1
Oktoberfest (starting mid- to late September)
@Dimesdan #2
All-Ireland Hurling Final (traditionally early September)
@Marynator #1:

The Nativity of the Blessed Virgin Mary (September 8th)
@Marynator #2:

National Yoga Month
@Avro Arrow #1:

Day of the Programmer (September 13th)
@Avro Arrow #2

Star Trek Day (September 8th)
@Kai "the spy" #1

International Literacy Day (September 8th)
@Kai "the spy" #2

German Butterbrot Day (September 25th)
@auntiehill

Talk like a Pirate Day (September 19th)
@rhubarbodendron #1

German Day of the Zebra-Crossing (September 1st)
@rhubarbodendron #2

Japanese Chrysanthemum Festival (September 9th)
@Dimesdan #1
Oktoberfest (starting mid- to late September)
@Dimesdan #2
All-Ireland Hurling Final (traditionally early September)