May 2nd is Roberts Rule of Order Day

Robert's Rules of Order is the short title of a book, written by Brig. Gen. Henry Martyn Robert, containing rules of order intended to be adopted as a parliamentary authority for use by a deliberative assembly.

Currently in its eleventh edition and published under the name Robert's Rules of Order Newly Revised (and often referred to using the initialism RONR), it is a widely used parliamentary authority in the English-speaking world.