As I am posting this on 10th (incidentally, my lovely sister's birthday!), I have missed a couple, but here you go -
1st - St David's Day.
8th - Shrove Tuesday - Oooh - Pancake Day! Yum!
14th - Save a Spider Day.
Spiders are fascinating creatures -
8-legged, air breathing arthropods.
There are approximately 40,000 species of spider.
Most spiders have 4 pairs of eyes.
Sizes range from 0.015" to 10"!! There are no spiders on Antarctica. Arachnophobia - A fear of spiders.
But no matter how scared you are of them, you have got to agree, their webs are beautiful!
17th - St Patrick's Day.
27th - BRITISH SUMMERTIME BEGINS - Please tell the weather!
Flower of March - Daffodil.
Birthstone - Aquamarine.

The most famous mad 'March Hare' is Lewis Carroll's character from 'Alice's Adventures in Wonderland' appearing at the tea party.

References -
http://en.wikipedia.org/wiki/Spider
http://en.wikipedia.org/wiki/Mad_as_a_March_hare
http://en.wikipedia.org/wiki/March_Hare
http://en.wikipedia.org/wiki/March
Alice's Adventures in Wonderland - Lewis Carroll