Ananda Vikatan (a tamil magazine) made a brief mention about this day in its latest issue.
There is a website dedicated to National Punctuation day (September 24th)
which mentions that
" it is a celebration of lowly commas,correctly used quotes and other proper use of periods,semi-solons and ever mysterious ellipsis"
It gives information on all the punctuations.
Have fun reading about Punctuations and find out why Semicolon is not a surgical procedure.