This comes after weeks of bloody protests against Mr Ruto’s Finance Bill, which has left many dead.
Many Kenyans were angered by the invitation and threatened to storm the venue.
“The past few days have been extraordinarily painful for any mother,” she wrote.
The human rights organisation said police continued shooting and killing of unarmed citizens into the night on Tuesday.
Tuesday’s anti-Finance Bill protest turned violent as Kenyan police fired live rounds at protesters, resulting in approximately ten deaths and 50 injuries.
“I concede and therefore I will not sign the 2024 Finance Bill,” said Mr Ruto.
Back home, the Kenyan police are enforcing a deadly crackdown on tax protesters.
At least 10 persons were killed and close to 50 injured as Kenyan police opened live rounds on anti-Finance Bill protesters in Nairobi on Tuesday.
Kenya has signed six grants totalling $462 million to support programmes targeting HIV, tuberculosis and malaria.
A fire outbreak was also seen in City Hall, the office of the governor of Nairobi, and the Supreme Court premises.
