Despite a range of events involving various national bodies in the year, the specific main event was the "1929 Centenary Parade", which was held on Wednesday 2 October (which had been made a public holiday) and known as the "Historic and Industrial Procession", passing through Perth. Wednesday 2 October 1929 was a public holiday in Perth. The main Centenary procession (1929 Centenary Parade) involved considerable preparation of floats representing commercial and regional attributes of the state. It passed through the streets of Perth. The Centenary Ball and celebrations at the Perth Oval were also held. The afternoon at Perth Oval on the same day was the site of a Naval and Military Tournament. In September, 1929, a choir of 1,000 voices sang at a Children's Thanksgiving Mass in Victoria Square, and also in a Centenary concert in His Majesty's Theatre. On 24 November 1929, the Kings Park War Memorial Cenotaph was unveiled by the Governor William Campion to commemorate the fallen of World War I. One of the events organised was a re-enactment of the 1829 arrival of settlers at Fremantle, attended by Campion. In October, the Premier, Philip Collier announced that prisoner sentences of more than one month would be reduced at the rate of two days for each month of sentence remaining, after allowing for good conduct. Prisoners serving sentences during His Majesty's pleasure were excluded from the remissions. Western Australian historian Geoffrey Bolton ties in the events and the subsequent difficult times due to the economic depression in his book "A Fine Country to Starve in" (1972). While more recently Annette Davis looked at the popular entertainment values of the era. A significant amount of the organisation of the celebrations was attributed to the librarian James Sykes Battye, whose efforts in organising committees were noted in the celebration year. The Royal Western Australian Historical Society commissioned plaques that were ceremonially placed upon locations of significance to Western Australia. Locations included: