Here is the list of Surfcasting Comps I have to date. Actual dates and times I do not have.
Sept: Invitational. Snapper 1000 Thornton
Sept: Wairarapa SFC Gurnard Hunt Castlepoint
Oct: The TOSC in Taranaki
Nov: Moki 1000 Ngawi
Nov: Great Exhibition Bay SC GE Bay
Jan: Rotorua Bonanza Matata
Jan: Otomarakau School Matata
Jan: Pania SCC Kahawai CompMarine Parade Napier
Jan: Porangahau SC Comp Porangahau
Feb: Beach & Boat Bream Bay
Feb: Wairoa Club Wairoa HB
Feb: Mohaka Surfcasting Comp Mohaka
Feb: Waikare Surf Comp Waikare
Feb:HBSFC Megafish Napier
Feb: Wish for Fish Tauranga
Feb: Fish & Dive Nth Canterbury
Feb: Taradale Club Surf & Sea
Mar: Ninety Mile Bonanza Ninety Mile Beach
Mar: Whangarei DSC One Base Whangarei
Mar: Hirepool Leigh FC Leigh Auckland
Mar: Thompson ITM FC Raglan
Mar: Huntly & District WMC Raglan
Mar: PON Family Classic Napier
Mar:Snapper Shootout Maraetai
Mar: Pukehina Fire Brigade FC Pukehina
Mar:Whanganui ECFA Monster Comp East Beach WHa
Apr: Glen Afton C&S Club Nelson
Apr: Tangimoana FC Tangimoana
Apr: Tairua LB Comp Tairua
May: Papamoa Beach FC Papamoa
Jun: Opotiki SC Opotiki
Jul: Bounty Hunter Coromandel
Some dates are out and can be found by google search.