Triduan

It seems to be a kind of understanding or unwritten compact between the orator and the audience, that he be allowed to talk without interruption as much as he pleases, so long as they are not called upon to listen to one word that he utters. Accordingly, during the delivery of one of these triduan discourses, the Senate of the United States wears the appearance of an orderly well-regulated reading-room; the members being comfortably seated in their arm-chairs, some looking over and answering private letters, some exchanging a few words in a low whisper with each other, or with friends in the strangers' gallery, others reading a newspaper, and all evincing the most philosophic indifference to the tedious harangue and the exhaustless lungs of the orator.

Source: wiktionary

These Litanies are also called Rogations, and Gang Days among the Saxons, and Gang Dawes by old English writers. They are triduan, and take place on the three days before Ascension Day.

Source: wiktionary

Faenza having escaped their brutality by denying them entrance, its citizens testified their gratitude for the exemption, by instituting an annual triduan thanksgiving, and dotation of two of their daughters.

Source: wiktionary

Such tents of assignation are still in use in the pilgrimages of Islam at Mecca, and are known to have been constructed and afterwards burned on the ‘tent-day’ of the triduan festival of Isis at Tithorea in Phocis.

Source: wiktionary