Westland Anniversary Day is observed in New Zealand's former historic province of Westland on the Monday closest to December 1. This public holiday commemorates the establishment of the Westland Province on December 1, 1873, which was the last province formed in New Zealand before the provincial system was abolished in 1876. The holiday reflects the region's history, particularly the gold rush that began in 1864, which significantly increased the population and led to Westland's separation from the Canterbury Province. Celebrations typically take place in towns such as Greymouth and Hokitika, where festive events are organized, although many people prefer to spend the long weekend with family and friends. The Westland District, which encompasses the area similar to the historic province, is the least populated district in New Zealand, with Hokitika as its seat.