Press Release – Waimakariri District Council Following 18 months of construction, MainPower Stadium will open its doors to the public at the official opening ceremony on Sunday 8 August. Waimakariri District Mayor, Dan Gordon, says he cant wait to see the reaction of the community once … Following 18 months of construction, MainPower Stadium will open its doors to the public at the official opening ceremony on Sunday 8 August. Waimakariri District Mayor, Dan Gordon, says he can’t wait to see the reaction of the community once they get inside the building, “It’s an incredibly well designed facility and I think our residents are going to be impressed.”