The ruling ZANU-PF party is hosting the event for Mugabe, who has held power since 1980 during a reign marked by repression of dissent, vote-rigging and the country's economic collapse.
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Now the world's oldest national leader, his actual birthday on Tuesday has been celebrated in a week-long extravaganza with state media filled with tributes and praise.
The annual party -- reported to cost up to one million dollars -- includes a multi-course feast and vast birthday cakes, angering many Zimbabweans as the country endures severe food shortages.
Holding the event at a school in Matobo has also riled locals as it is close to where many victims of Mugabe's deadly crackdown on dissidents in the early 1980s are thought to be buried.
At least 20,000 people are believed to have been killed in the massacres by North Korean-trained Zimbabwean troops, according to rights groups.
"This should not be a place for celebration," Mbuso Fuzwayo, spokesman for the Bulawayo-based campaign group Ibhetshu Likazulu explicated.
"The whole area is a crime scene where the bones of victims of the massacres are buried," he added.
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Mugabe gave a faltering television interview this week, vowing to remain in power despite growing signs of frailty.
During the pre-recorded birthday broadcast, Mugabe paused at length between sentences and spoke with his eyes barely open.
"The call to step down must come from my party," he said.
"If I feel that I can't do it anymore, I will say so to my party so that they relieve me, but for now, I think I can't say so," he reiterated.
The state-owned Herald newspaper on Tuesday published a 24-page supplement of congratulatory messages from government departments and regime loyalists.
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Local ZANU-PF party activist Sibongile Ndiweni described hosting of the party as 'a blessing'.
"It's an honour and privilege to have such a luminary icon celebrating with us," he said.
"Mugabe is a national president who has the right to have an event wherever he feels like," he added.
ZANU-PF endorsed Mugabe as its candidate for general elections next year, and he remains widely respected as a liberation hero by other African leaders.
He has avoided naming a successor, but his wife, Grace, 51, is seen as a possible candidate along with vice-president Emmerson Mnangagwa.
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