World Grammar Day The 10th World Grammar Day will be held on 4th March. World Grammar day started in 2008 when Martha Brockenbrough decided that she wanted to assist her students with their written and spoken English in a way that would hold their interest and teach them how to write English the correct way. Martha Brockenbrough is an author who writes books for both adults and children. World Grammar Day is also celebrated in Sweden on March 23rd. National Proofreading Day N