Any day can be Burn A Religious Text Day. Just take the day and look for some historical atrocity or crime committed on that day and determine who committed it and their religion. Then burn their religious text. It's really quite simple.
For example September 11 is the anniversary of the brutal 1973 coup by Augusto Pinochet against the democratically elected government of Chile and the assassination of President Salvador Allende. I couldn't find Pinochet's religion, but he went to a seminary school taught by brothers, and after all it is South America, so we will assume he was Catholic. Anyway, facts are not important on Burn A Religious Text Day. The important thing is to insult all the members of a religious community, supposedly to right a wrong committed by one or a few of the members of that community. So in that case we would burn the Bible. I would suggest burning the New Testament because burning the Old Testament would be the same as burning the Qur'an, since the messages in both of them are so similar. And, apparently, there already is a Burn The Koran Day.
So that's it. Happy Burn A Religious Text Day everybody.