The 125th anniversary Golden Bay A and P Show, including its annual shearing competition, was to have been held at Takaka on January 15.
"Due to the uncertainty of the Covid-19 restrictions and the severity of the Delta strain we feel unable to hold the show safely," its committee statement said.
Shows still to be held pre-Christmas are all expected to be run under Covid-19 level 2 alert conditions, without general public admission - as have been the three competitions that have already taken place.
The calendar for shearing sports events still going ahead pre-Christmas is:
November 6: Marlborough A and P Show (shearing only), at Blenheim; Gymkhana Shears (shearing only), at Pleasant Point.
November 11-12: Canterbury Shears (New Zealand Corriedale Shearing and Woolhandling Championships), at Christchurch.
November 20: Nelson A and P Show (shearing only), at Richmond Park, Nelson.