Labour MP Alison McGovern said the death of Sophie Jones, who died of cervical cancer aged 19 after she was refused a smear test because of her age, shows that a "culture change" is needed within the NHS.
Speaking during a debate on lowering the age of eligibility for cervical screening from 25, she said that the NHS "must listen to young women".
"There are lots of forces in society that are set up to undermine young women," she added. "Please let's not have the NHS be one of them."
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Among those expected to attend the ceremony will be former US President Bill Clinton and ex-Northern Ireland first minister Peter Robinson.
Five people have been killed and 40 injured after a car and knife attack in London on Wednesday.
A wet, wintry night in places with rain and hill snow slow to move away from southern Scotland and northern England.