Christchurch Mayor Lianne Dalziel is recovering from concussion after fainting and hitting her head at a public event yesterday.

Dalziel will miss a victory celebration today in honour of the Crusaders, who won the Super Rugby title in front of a sell-out home crowd on Saturday.

She was due to host the event but has been told by a doctor to take two days off after fainting and falling at a commemoration marking the 73rd anniversary of the nuclear bombing of Hiroshima and Nagasaki at the World Peace Bell at Christchurch Botanic Gardens yesterday.

A spokeswoman for Christchurch City Council said Dalziel was checked over at neighbouring Christchurch Hospital after hitting her head.

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She was discharged yesterday but diagnosed with concussion and told to rest up for a few days, the spokeswoman said.

Dalziel rang the bell at 11.16am yesterday - the exact time the A-bomb was dropped on Hiroshima 73 years ago.

Crusaders captain Sam Whitelock will lead the back-to-back champions on trams to meet fans before walking across the Bridge of Remembrance for a victory celebration that was to be hosted by Dalziel, but will now be led by deputy mayor Andrew Turner.

Dalziel said in a statement at the weekend it was fitting the Crusaders won in front of their passionate home crowd.

"Our team has done us proud."