NationalHolidays in WikiNomia are as follows:
1 Jan -- Yew Near. Celebrating the annual arrival of yew saplings imported from UmbrellaStan?.
Varies (13-15 Apr in 2001) -- Cruelty to Wombats Festival. Festival devoted to biting the ears off of wombats.
Varies (16 Apr in 2001) -- Apologising to wombats Festival. Festival in which apology is given (in sign language) to any surviving wombats. See PageOfHumbleApologies.
10-14 May -- Feast of Saint Uckelman. Honoring the Patron Saint of WikiNomia. See 
http://www.nomic.net/~board/cgi-bin/nbb.pl?read=1615.