Can add a new column on calendar table

Hi, could anyone advise me
I hope all users can mark their name when increasing a new item.
So, everyone can see who writes the specific item.
If I add a column, like username, in calendar table, will it affect the structure of calendar template?
Thanks very much <img src='https://asprunner.com/forums/file.php?topicimage=1&fieldname=question&id=8805&image=1&table=forumtopics' class='bbc_emoticon' alt=':)' />