Occiboonah is one of the happiest days in the Tarvunian calendar.
Tarvunian festival marking the period in which Tarvu swam with Oobu and the octopuses in the seas for 9 years. During Occiboonah, Tarvuists are not allowed to use pens (octopus ink is holy) or eat calamari. In fact, Tarvuists do not eat calamari at all, although lapse Tarvuists might do so, just as, say, some unreligious Jews have been known to enjoy bacon when eating in a restaurant or hotel.